{"id":57520,"date":"2025-12-18T04:22:41","date_gmt":"2025-12-17T19:22:41","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=57520"},"modified":"2025-12-18T04:22:41","modified_gmt":"2025-12-17T19:22:41","slug":"la-mesa-se-convierte-en-laboratorio-el-sorprendente-mundo-oculto-de-los-chirimon-en-los-peces-diminutos","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=57520&lang=es","title":{"rendered":"\u00a1La mesa se convierte en laboratorio! El sorprendente mundo oculto de los \u201cChirimon\u201d en los peces diminutos"},"content":{"rendered":"<p style=\"text-align: center;\"><span style=\"color: #339966;\"><strong>\u00a1Hola! Soy Ken Kuwako, instructor de ciencias. Para m\u00ed, cada d\u00eda es un experimento.<\/strong><\/span><\/p>\n<p>\u00bfAlguna vez te has detenido a observar de cerca el &#8220;chirimen-jako&#8221; (peque\u00f1as cr\u00edas de sardina secas) que acompa\u00f1a tu arroz? Aunque parezca solo comida, en realidad es una c\u00e1psula que contiene el vasto ecosistema del oc\u00e9ano. Hoy les traigo un reporte de una actividad que realic\u00e9 con mis alumnos del club de ciencias: &#8220;La b\u00fasqueda del tesoro marino&#8221;. Este tema incluso aparece en los libros de texto actuales. \u00a1Prep\u00e1rate para transformar tu mesa en un emocionante laboratorio!<\/p>\n<h3>&#8220;Monstruos de Chirimen&#8221;: Un peque\u00f1o acuario en tu plato<\/h3>\n<p>Lo que hoy es tendencia, e incluso aparece en los libros de biolog\u00eda de la editorial Keirinkan, es la b\u00fasqueda de los <strong>Monstruos de Chirimen<\/strong> (apodados &#8220;Chirimon&#8221;). Estos monstruos no son m\u00e1s que peque\u00f1as criaturas distintas a las sardinas que quedan mezcladas durante la pesca. Hablamos de beb\u00e9s de camar\u00f3n, cangrejos, pulpos, moluscos y, a veces, hasta parientes de los caballitos de mar. \u00a1Hay una biodiversidad incre\u00edble escondida all\u00ed!<\/p>\n<p>Normalmente, estos se retiran como &#8220;impurezas&#8221;, pero si cambiamos nuestra perspectiva, se convierten en <strong>el mejor material did\u00e1ctico para aprender sobre la biodiversidad marina<\/strong>. Consegu\u00ed una muestra y me puse manos a la obra con mis alumnos para identificarlos. Nuestra mejor gu\u00eda fue este libro:<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/amzn.to\/490Gkok\">\u00a1Busca a los Monstruos de Chirimen!<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57444 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-17.13.52.jpg\" alt=\"\" width=\"291\" height=\"386\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-17.13.52.jpg 516w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-17.13.52-226x300.jpg 226w\" sizes=\"auto, (max-width: 291px) 100vw, 291px\" \/><\/p>\n<h3>La importancia de que &#8220;no est\u00e9n seleccionados&#8221;<\/h3>\n<p>El chirimen-jako que compras en el supermercado suele estar meticulosamente limpio y seleccionado para evitar quejas de los consumidores. Sin embargo, para nosotros, \u00a1la mezcla es lo m\u00e1s valioso! Por eso, esta vez compramos <strong>chirimen-jako sin seleccionar<\/strong> directamente de un proveedor educativo. As\u00ed, la probabilidad de encontrar variedad es mucho mayor.<\/p>\n<p>Aqu\u00ed pueden ver la muestra del supermercado para comparar. A veces se encuentra algo si buscas bien, como en este paquete de Awajishima.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57445 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.40.jpg\" alt=\"\" width=\"304\" height=\"345\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.40.jpg 1010w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.40-264x300.jpg 264w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.40-902x1024.jpg 902w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.40-768x871.jpg 768w\" sizes=\"auto, (max-width: 304px) 100vw, 304px\" \/><\/p>\n<p>Y <a href=\"https:\/\/www.kanejo.com\/tirimon\/tirimon.html\">aqu\u00ed<\/a> est\u00e1 la muestra &#8220;sin seleccionar&#8221; que pedimos.<\/p>\n<p><a href=\"https:\/\/www.kanejo.com\/tirimon\/tirimon.html\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57446 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-17.19.12.jpg\" alt=\"\" width=\"338\" height=\"289\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-17.19.12.jpg 1490w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-17.19.12-300x257.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-17.19.12-1024x876.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-17.19.12-768x657.jpg 768w\" sizes=\"auto, (max-width: 338px) 100vw, 338px\" \/><\/a><\/p>\n<p>\u00a1La diferencia salta a la vista! Ese caos es el verdadero rostro del mar. Con pinzas en mano, comenzamos nuestra expedici\u00f3n.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57447 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.04.jpg\" alt=\"\" width=\"577\" height=\"429\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.04.jpg 1354w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.04-300x223.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.04-1024x761.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.04-768x571.jpg 768w\" sizes=\"auto, (max-width: 577px) 100vw, 577px\" \/><\/p>\n<h3>\u00a1Hallazgos! Los micro-habitantes del oc\u00e9ano<\/h3>\n<p>Lo m\u00e1s f\u00e1cil de encontrar son los peque\u00f1os camarones. Conservan un color rojizo muy llamativo.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-57449 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.24.jpg\" alt=\"\" width=\"554\" height=\"512\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.24.jpg 554w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.24-300x277.jpg 300w\" sizes=\"auto, (max-width: 554px) 100vw, 554px\" \/><\/p>\n<p>Tambi\u00e9n aparecen peces con formas totalmente distintas a las de la sardina com\u00fan.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57450 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.32.jpg\" alt=\"\" width=\"547\" height=\"557\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.32.jpg 846w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.32-294x300.jpg 294w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.32-768x783.jpg 768w\" sizes=\"auto, (max-width: 547px) 100vw, 547px\" \/><\/p>\n<p><strong>Un truco para la observaci\u00f3n es usar papel negro<\/strong>. Los cuerpos blancos resaltan y es mucho m\u00e1s f\u00e1cil apreciar detalles como la forma de las aletas.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57451 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.52.jpg\" alt=\"\" width=\"575\" height=\"458\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.52.jpg 1438w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.52-300x239.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.52-1024x816.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.52-768x612.jpg 768w\" sizes=\"auto, (max-width: 575px) 100vw, 575px\" \/><\/p>\n<p>\u00a1Miren esto! Un pez muy alargado y extra\u00f1o. Podr\u00eda ser un pez aguja o alg\u00fan pariente del caballito de mar.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57452 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.59.jpg\" alt=\"\" width=\"580\" height=\"399\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.59.jpg 986w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.59-300x206.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.26.59-768x528.jpg 768w\" sizes=\"auto, (max-width: 580px) 100vw, 580px\" \/><\/p>\n<p>Aqu\u00ed tenemos un beb\u00e9 de pulpo (o quiz\u00e1s calamar). Es adorable ver que, incluso a este tama\u00f1o, ya se distinguen sus ventosas y tent\u00e1culos.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57453 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.03.jpg\" alt=\"\" width=\"305\" height=\"326\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.03.jpg 522w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.03-281x300.jpg 281w\" sizes=\"auto, (max-width: 305px) 100vw, 305px\" \/><\/p>\n<p>&#8220;\u00bfQu\u00e9 es esto?&#8221; Cuando aparece una criatura desconocida, a los alumnos les brilla la mirada.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57454 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.07.jpg\" alt=\"\" width=\"387\" height=\"320\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.07.jpg 488w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.07-300x248.jpg 300w\" sizes=\"auto, (max-width: 387px) 100vw, 387px\" \/><\/p>\n<p>\u00bfSer\u00e1 un peque\u00f1o bivalvo? Se ve muy transparente y delicado.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-57455 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.17.jpg\" alt=\"\" width=\"426\" height=\"406\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.17.jpg 426w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.17-300x286.jpg 300w\" sizes=\"auto, (max-width: 426px) 100vw, 426px\" \/><\/p>\n<h3>La alegr\u00eda de la identificaci\u00f3n: Consultando la gu\u00eda<\/h3>\n<p>Comparar lo que encontramos con las fotos del libro para descubrir sus nombres es la esencia de la investigaci\u00f3n cient\u00edfica.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57456 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.41.jpg\" alt=\"\" width=\"652\" height=\"867\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.41.jpg 1166w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.41-226x300.jpg 226w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.41-770x1024.jpg 770w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.41-768x1021.jpg 768w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.41-1155x1536.jpg 1155w\" sizes=\"auto, (max-width: 652px) 100vw, 652px\" \/><\/p>\n<p>Resulta que este pez de aletas peculiares es un pariente del <strong>pez conejo (Siganus)<\/strong>. De adultos son conocidos por tener espinas venenosas; es incre\u00edble ver ese rasgo desde que son beb\u00e9s.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57460 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.26.jpg\" alt=\"\" width=\"654\" height=\"915\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.26.jpg 866w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.26-214x300.jpg 214w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.26-732x1024.jpg 732w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.26-768x1075.jpg 768w\" sizes=\"auto, (max-width: 654px) 100vw, 654px\" \/><\/p>\n<p>Este result\u00f3 ser, efectivamente, un peque\u00f1o pulpo.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57462 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.38.jpg\" alt=\"\" width=\"668\" height=\"693\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.38.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.38-289x300.jpg 289w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.38-987x1024.jpg 987w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.38-768x797.jpg 768w\" sizes=\"auto, (max-width: 668px) 100vw, 668px\" \/><\/p>\n<p>Incluso hallamos un tipo de camar\u00f3n de aguas profundas. Es sorprendente que criaturas del fondo del mar terminen mezcladas en nuestra comida.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-57461 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.33.jpg\" alt=\"\" width=\"653\" height=\"542\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.33.jpg 1158w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.33-300x249.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.33-1024x851.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.33-768x638.jpg 768w\" sizes=\"auto, (max-width: 653px) 100vw, 653px\" \/><\/p>\n<h3>\u00a1Parece un alien! La impactante larva &#8220;Zoea&#8221;<\/h3>\n<p>Pero el gran descubrimiento del d\u00eda fue este: un ser con largos cuernos en la cabeza que parece venido de otro planeta.<\/p>\n<p>Se trata de una <strong>larva de cangrejo<\/strong> en su etapa conocida como <strong>Zoea<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-57463 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.45.jpg\" alt=\"\" width=\"492\" height=\"503\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.45.jpg 860w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.45-294x300.jpg 294w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.28.45-768x784.jpg 768w\" sizes=\"auto, (max-width: 492px) 100vw, 492px\" \/><\/p>\n<p>Cuando pensamos en cangrejos, imaginamos su caparaz\u00f3n caminando de lado, pero de beb\u00e9s flotan en el mar como plancton con esta forma tan extra\u00f1a. Despu\u00e9s pasar\u00e1n por la etapa de &#8220;Megalopa&#8221; (parecida a un ermita\u00f1o) antes de convertirse en el cangrejo que todos conocemos.<\/p>\n<p>Es, sin duda, el misterio de la vida. De un simple plato de chirimen-jako podemos aprender sobre la cadena alimenticia y los ciclos de vida. Les animo a que lo intenten en casa con sus hijos; \u00a1seguro que encontrar\u00e1n algo que les deje con la boca abierta!<\/p>\n<h3>Contacto y Consultas<\/h3>\n<p>\u00a1Hagamos que la ciencia sea algo cotidiano y divertido! Aqu\u00ed encontrar\u00e1s experimentos f\u00e1ciles para hacer en casa y muchos trucos cient\u00edficos. \u00a1Explora el sitio! \u30fbEl contenido de &#8220;Notas Cient\u00edficas&#8221; ya est\u00e1 disponible en libro. M\u00e1s detalles <a href=\"https:\/\/amzn.to\/42PMCEL\">aqu\u00ed<\/a>. \u30fbSobre el autor, Ken Kuwako: <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=37\">aqu\u00ed<\/a>. \u30fbPara servicios (redacci\u00f3n, conferencias, talleres, supervisi\u00f3n de TV, etc.): <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">aqu\u00ed<\/a>. <span class=\"s2\">\u30fb\u00a1Sigue las actualizaciones en <a href=\"https:\/\/x.com\/kuwako\">X (Twitter)<\/a>!<\/span><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.youtube.com\/user\/kkuwako\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35048\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/3d9640dad7bc5538e76f92da1966ee19.jpg\" alt=\"\" width=\"30\" height=\"21\" \/><\/a> \u00a1Mira los experimentos en video en nuestro <a href=\"https:\/\/www.youtube.com\/user\/kkuwako?sub_confirmation=1\">Canal de Notas Cient\u00edficas<\/a>!<\/p>\n<h3>\uff15\u6708\u306e\u30a4\u30c1\u30aa\u30b7\u5b9f\u9a13\uff01<\/h3>\r\n<p>\u30ad\u30fc\u30f3\u3068\u51b7\u3048\u308b\u30c9\u30e9\u30a4\u30a2\u30a4\u30b9\uff01\u6c17\u6e29\u304c\u4e0a\u304c\u3063\u3066\u304f\u308b\u3053\u306e\u6642\u671f\u30fb\u30c9\u30e9\u30a4\u30a2\u30a4\u30b9\u3092\u4f7f\u3063\u305f\u6607\u83ef\u30fb\u51dd\u7d50\u30fb\u7b49\u901f\u5ea6\u76f4\u7dda\u904b\u52d5\u306e\u5b9f\u9a13\u306f\u3044\u304b\u304c\uff1f<\/p>\r\n<p><img class=\"alignnone wp-image-39516 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe.jpg\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe.jpg 1406w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-300x168.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-1024x572.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-768x429.jpg 768w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-320x180.jpg 320w\" alt=\"\" width=\"453\" height=\"253\" \/><\/p>\r\n<p style=\"text-align: center;\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=39513\">\u6db2\u4f53\u30bc\u30ed\uff01\u30c9\u30e9\u30a4\u30a2\u30a4\u30b9\u304c\u6d88\u3048\u308b\u307e\u3067\u306e\uff13\u6642\u9593\u3092\u79d1\u5b66\u3059\u308b\uff08\u6607\u83ef\u30fb\u51dd\u7d50\u30fb\u7b49\u901f\u5ea6\u76f4\u7dda\u904b\u52d5\uff09<\/a><\/p>\r\n<h3 style=\"text-align: left;\"><span style=\"font-size: medium;\"><b><strong>\u30c6\u30ec\u30d3\u756a\u7d44\u76e3\u4fee\u30fb\u30a4\u30d9\u30f3\u30c8\u7b49\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/span><\/h3>\r\n<ul>\r\n<li>4\u670830\u65e5\uff08\u6728\uff09\u300cTHE\u7a81\u7834\u30d5\u30a1\u30a4\u30eb\u300d\uff08\u65e5\u672c\u30c6\u30ec\u30d3\uff09\u306e<a href=\"https:\/\/phys-edu.net\/wp\/?p=62906\">\u79d1\u5b66\u76e3\u4fee\u3092\u62c5\u5f53\u3057\u307e\u3057\u305f<\/a>\u3002<\/li>\r\n<li>5\u67088\u65e5\uff08\u91d1\uff09<a href=\"https:\/\/phys-edu.net\/wp\/?p=62629\">\u7406\u79d1\u6559\u80b2\u30cb\u30e5\u30fc\u30b9<\/a>\u3092\u62c5\u5f53\u3057\u307e\u3057\u305f\u3002<\/li>\r\n<li>6\u670814\u65e5\uff08\u65e5\uff09\u3000\u5343\u8449\u5927\u5b66\u30a4\u30f3\u30b9\u30bf\u30ec\u30fc\u30b7\u30e7\u30f3\u300c\u63a2\u7a76\u300d\u306b\u3066\u8b1b\u5e2b\u3092\u52d9\u3081\u307e\u3059<\/li>\r\n<li>6\u670826\u65e5\uff08\u91d1\uff09\u3000\u5343\u8449\u5927\u5b66\u306e\u516c\u958b\u7814\u7a76\u4f1a\uff08\u4e2d\u5b66\u7406\u79d1\u306b\u3064\u3044\u3066\u6388\u696d\u516c\u958b\u4e88\u5b9a\uff09<\/li>\r\n<li>7\u670818\u65e5\uff08\u571f\uff09\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=60018\">\u6559\u54e1\u5411\u3051\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\u300c\u30ca\u30ea\u30ab\u30ab\u30b5\u30a4\u30a8\u30f3\u30b9\u30a2\u30ab\u30c7\u30df\u30fc\u300d\u306e\u8b1b\u5e2b\u3092\u3057\u307e\u3059<\/a>\u3002\u304a\u4f1a\u3044\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\r\n<\/ul>\r\n<h3><b>\u66f8\u7c4d<strong>\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/h3>\r\n<ul>\r\n<li>\u300e\u5927\u4eba\u306e\u305f\u3081\u306e\u9ad8\u6821\u7269\u7406\u5fa9\u7fd2\u5e33\u300f\uff08\u8b1b\u8ac7\u793e\uff09\u2026\u4e00\u822c\u5411\u3051\u306b\u65e5\u5e38\u306e\u7269\u7406\u306b\u3064\u3044\u3066\u516c\u5f0f\u3092\u5143\u306b\u7d10\u89e3\u304d\u307e\u3057\u305f\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=1827\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u3067\u306f\u5b9f\u9a13\u3092\u591a\u6570\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<strong>\u203b\u5897\u5237\u304c\u304b\u304b\u308a\uff16\u5237\u3068\u306a\u308a\u307e\u3057\u305f\uff082026\/02\/01\uff09<br \/><img class=\"alignnone wp-image-10940 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg\" sizes=\"(max-width: 220px) 100vw, 220px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0.jpg 311w\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2014-07-05 0.43.51\" width=\"220\" height=\"192\" \/><br \/><\/strong><\/li>\r\n<li>\u300e\u304d\u3081\u308b!\u5171\u901a\u30c6\u30b9\u30c8 \u7269\u7406\u57fa\u790e \u6539\u8a02\u7248\u300f\uff08\u5b66\u7814\uff09\u2026\u3000\u9ad8\u6821\u7269\u7406\u306e\u53c2\u8003\u66f8\u3067\u3059\u3002\u30a4\u30e9\u30b9\u30c8\u3092\u591a\u304f\u3057\u3066\u30a4\u30e1\u30fc\u30b8\u304c\u6301\u3066\u308b\u3088\u3046\u306b\u63cf\u304d\u307e\u3057\u305f\u3002\u6388\u696d\u306b\u3064\u3044\u3066\u3044\u3051\u306a\u3044\u3001\u7269\u7406\u304c\u82e6\u624b\u3001\u305d\u3093\u306a\u751f\u5f92\u306b\u304a\u3059\u3059\u3081\u3067\u3059\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=45322\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u306f\u3053\u3061\u3089\u3002<br \/><img class=\"alignnone wp-image-45718 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c.jpg\" sizes=\"(max-width: 184px) 100vw, 184px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c.jpg 756w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c-300x269.jpg 300w\" alt=\"\" width=\"184\" height=\"165\" \/><\/li>\r\n<\/ul>\r\n<h3><span style=\"text-align: center;\">\u5404\u7a2eSNS\uff08\u66f4\u65b0\u60c5\u5831\u3092\u304a\u5c4a\u3051\uff01\uff09<\/span><\/h3>\r\n<p style=\"text-align: center;\"><a style=\"text-align: center;\" href=\"https:\/\/twitter.com\/kuwako\">X(Twitter)<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.instagram.com\/science_seeds\/\">instagram<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.facebook.com\/kuwakolab\/\">Facebook<\/a>\uff08\u65e5\u672c\u8a9e\uff09<\/p>\r\n<p style=\"text-align: center;\"><a style=\"text-align: center;\" href=\"https:\/\/bsky.app\/profile\/kagakunoneta.bsky.social\">BlueSky<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.threads.net\/@science_seeds?hl=ja\">Threads<\/a>\uff08\u82f1\u8a9e\uff09<\/p>\r\n<h3 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href=\"http:\/\/phys-edu.net\/wp\/?page_id=37\">About<\/a>\u00a0\u2026\u300c\u79d1\u5b66\u306e\u30cd\u30bf\u5e33\u300d\u306e\u30b3\u30f3\u30bb\u30d7\u30c8\u3084\u3001\u904b\u55b6\u8005\u3067\u3042\u308b\u6851\u5b50\u7814\u306e\u30d7\u30ed\u30d5\u30a3\u30fc\u30eb\u30fb\u60f3\u3044\u3092\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/li>\r\n<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">\u304a\u554f\u3044\u5408\u308f\u305b<\/a> \u2026\u5b9f\u9a13\u6559\u5ba4\u306e\u3054\u4f9d\u983c\u3001\u57f7\u7b46\u30fb\u8b1b\u6f14\u306e\u76f8\u8ac7\u3001\u79d1\u5b66\u76e3\u4fee\u7b49\u306f\u3053\u3061\u3089\u306e\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u304a\u5bc4\u305b\u304f\u3060\u3055\u3044\u3002<\/li>\r\n<\/ul>\r\n","protected":false},"excerpt":{"rendered":"<p>\u00a1Hola! Soy Ken Kuwako, instructor de ciencias. Para m\u00ed, cada d\u00eda es un experimento. \u00bfAlguna vez te has detenid [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":57453,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","sns_share_botton_hide":"","vkExUnit_sns_title":"","vkexunit_cta_each_option":"","_lightning_design_setting":{"layout":"default"},"footnotes":""},"categories":[1492],"tags":[],"class_list":["post-57520","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-es"],"jetpack_featured_media_url":"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-12-16-14.27.03.jpg","jetpack-related-posts":[{"id":56523,"url":"https:\/\/phys-edu.net\/wp\/?p=56523&lang=es","url_meta":{"origin":57520,"position":0},"title":"\u00bf\u00a1El aula se convierte en una pista de curling!? Vive la f\u00edsica de \u2018cero fricci\u00f3n\u2019 con hielo seco (Ley de la inercia)","author":"\u6851\u5b50 \u7814","date":"2025\u5e7411\u670830\u65e5","format":false,"excerpt":"Soy Ken Kuwako, entrenador de ciencias. \u00a1Cada d\u00eda \u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=1492&lang=es"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/09\/FullSizeRender-3.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/09\/FullSizeRender-3.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/09\/FullSizeRender-3.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/09\/FullSizeRender-3.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":55764,"url":"https:\/\/phys-edu.net\/wp\/?p=55764&lang=es","url_meta":{"origin":57520,"position":1},"title":"\u00a1Magia en la Pantalla! 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P\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=1492&lang=es"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/01\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-12-31-7.11.31.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/01\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-12-31-7.11.31.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/01\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-12-31-7.11.31.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/01\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-12-31-7.11.31.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/01\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-12-31-7.11.31.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/01\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-12-31-7.11.31.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":51348,"url":"https:\/\/phys-edu.net\/wp\/?p=51348&lang=es","url_meta":{"origin":57520,"position":4},"title":"Elaboraci\u00f3n y eliminaci\u00f3n de agua de cal (\u00bfEs el agua de cal algo que se compra? 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Cada d\u00eda e\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=1492&lang=es"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/664a7532c8b8ecc6ea069625ebef41ee.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/664a7532c8b8ecc6ea069625ebef41ee.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/664a7532c8b8ecc6ea069625ebef41ee.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/664a7532c8b8ecc6ea069625ebef41ee.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/664a7532c8b8ecc6ea069625ebef41ee.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":61066,"url":"https:\/\/phys-edu.net\/wp\/?p=61066&lang=es","url_meta":{"origin":57520,"position":5},"title":"\u00bfCambia el mundo cuando cambia tu perspectiva? 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