{"id":54896,"date":"2026-02-03T04:14:42","date_gmt":"2026-02-02T19:14:42","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=54896"},"modified":"2026-02-03T05:03:53","modified_gmt":"2026-02-02T20:03:53","slug":"internet-magic-in-an-umbrella-sleeve-the-total-reflection-trick","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=54896&lang=en","title":{"rendered":"From Umbrella Bags to Magic Threads! The Secret of Optical Fibers Revealed in an Instant \u2014 Total Internal Reflection Experiment"},"content":{"rendered":"<p style=\"text-align: center;\"><span style=\"color: #339966;\"><strong>I am Ken Kuwako, your science trainer. Every day is an experiment!<\/strong><\/span><\/p>\n<p><a href=\"https:\/\/phys-edu.net\/wp\/?p=22745\">In my last post, we used a simple umbrella bag to explore &#8220;light scattering&#8221;\u2014the reason why the sky is blue and sunsets are red.<\/a> Today, let\u2019s dive into the secrets of <b>fiber optics<\/b>, the massive infrastructure that powers our modern world!<\/p>\n<p>What exactly is &#8220;Fiber Optics&#8221;?<br \/>\nWhat comes to mind when you hear the term &#8220;fiber optics&#8221;? When I ask my students, they usually tilt their heads and look a bit puzzled. That\u2019s fair\u2014fiber optics are usually hidden away where we can&#8217;t see them. But when I show them the real thing and shine a light through one end, watching the other end burst into a bright glow, their faces light up.<\/p>\n<p>&#8220;<b>Oh! It\u2019s like those sparkly Christmas tree decorations!<\/b>&#8221;<\/p>\n<p><iframe loading=\"lazy\" title=\"\u5168\u53cd\u5c04\u3092\u3084\u3063\u305f\u3089\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u3002\uff5c\u30cf\u30f3\u30ba\u306b\u884c\u3053\u3046\uff01\" width=\"1140\" height=\"641\" src=\"https:\/\/www.youtube.com\/embed\/kED64BqtLu4?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Exactly! These days, fiber optics are very common as decorative illumination. However, their true power goes far beyond just looking pretty. They are the lifelines of modern society, enabling <b>ultra-high-speed internet<\/b> and allowing doctors to see inside the body using <b>endoscopes<\/b> (like gastric cameras). The secret behind this technology is a phenomenon called &#8220;<b>total internal reflection<\/b>,&#8221; which traps light inside without letting a single drop escape.<\/p>\n<p>This &#8220;magic&#8221; might sound complicated, but we can recreate it ourselves using nothing more than an umbrella bag!<\/p>\n<p>Science Recipe: The Umbrella Bag Fiber Optic!<br \/>\n<b>What you\u2019ll need:<\/b><\/p>\n<ul>\n<li>A thick straw or an umbrella bag (the more transparent, the better)<\/li>\n<li>Soap (liquid hand soap works great, but dish soap or bath salts also work)<\/li>\n<li>Water<\/li>\n<li>An LED light<\/li>\n<li>A laser pointer (the star of the show!)<\/li>\n<\/ul>\n<p><b>Instructions:<\/b><\/p>\n<p>Fill the umbrella bag with plenty of water. Then, dissolve &#8220;<b>just a tiny bit<\/b>&#8221; of soap into it. Start with <b>1 to 3 drops<\/b>. Adding too much is the quickest way to fail! Adjusting bit by bit is the hallmark of a true scientist.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35534 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/017c2ae5a63fe15b27e9c60955299ea4.jpg\" alt=\"\" width=\"551\" height=\"301\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/017c2ae5a63fe15b27e9c60955299ea4.jpg 1252w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/017c2ae5a63fe15b27e9c60955299ea4-300x164.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/017c2ae5a63fe15b27e9c60955299ea4-1024x559.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/017c2ae5a63fe15b27e9c60955299ea4-768x420.jpg 768w\" sizes=\"auto, (max-width: 551px) 100vw, 551px\" \/><\/p>\n<p>Why add soap? It\u2019s to suspend microscopic soap particles (<b>colloids<\/b>) in the water. When the laser hits these particles, the light <b>scatters<\/b> in all directions. This is known as the &#8220;<b>Tyndall effect<\/b>,&#8221; and it\u2019s what allows us to clearly see the &#8220;path of light.&#8221;<\/p>\n<p>Make the room as dark as possible. This is where the fun begins!<\/p>\n<p>Gently aim your laser pointer into the end of the umbrella bag.<\/p>\n<p>Check out this video to see it in action:<\/p>\n<p><iframe loading=\"lazy\" title=\"\u5098\u888b\u304c\u9b54\u6cd5\u306e\u7cf8\u306b\uff1f\u4e00\u77ac\u3067\u308f\u304b\u308b\u300c\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u300d\u306e\u79d8\u5bc6\u3068\u5168\u53cd\u5c04\u5b9f\u9a13\u3010\u5149\u306e\u5168\u53cd\u5c04\u3011\" width=\"1140\" height=\"641\" src=\"https:\/\/www.youtube.com\/embed\/keiW_4qrjz0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>When you aim the laser into the end of the bag\u2014even at an angle\u2014the light doesn&#8217;t escape through the sides. Instead, it bounces off the walls repeatedly until it reaches the other end. As a result, the entire bag glows a brilliant red, like a long, glowing gemstone.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35533 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/e8c41da2737bda3d7fda01b808a945c5.jpg\" alt=\"\" width=\"556\" height=\"306\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/e8c41da2737bda3d7fda01b808a945c5.jpg 1262w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/e8c41da2737bda3d7fda01b808a945c5-300x165.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/e8c41da2737bda3d7fda01b808a945c5-1024x563.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/e8c41da2737bda3d7fda01b808a945c5-768x422.jpg 768w\" sizes=\"auto, (max-width: 556px) 100vw, 556px\" \/><\/p>\n<p>Note: If the soapy water is too cloudy, the light will be blocked and won&#8217;t reach the end. <b>Finding that perfect &#8220;dilution&#8221; is the key to success.<\/b><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-23201 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/11\/b98ba2070acd2688fa90d38c39057bb1-268x300.jpg\" alt=\"Screenshot 2015-11-22 7.27.31\" width=\"448\" height=\"501\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/11\/b98ba2070acd2688fa90d38c39057bb1-268x300.jpg 268w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/11\/b98ba2070acd2688fa90d38c39057bb1.jpg 386w\" sizes=\"auto, (max-width: 448px) 100vw, 448px\" \/><\/p>\n<p>Now for the main event! Try slowly changing the <b>angle<\/b> of your laser.<\/p>\n<p>As you aim the light at a shallow angle against the wall of the bag&#8230; at a certain point, <b>the light will stop leaking out entirely<\/b>. You\u2019ll see it zigzagging perfectly down the bag!<\/p>\n<p>This is the moment of scientific magic: <b>Total Internal Reflection<\/b>!<\/p>\n<p><a href=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/11\/afd0f28f47c8870683af4a4d85abf62f.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-23202 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/11\/afd0f28f47c8870683af4a4d85abf62f-300x165.jpg\" alt=\"Screenshot 2015-11-22 7.26.31\" width=\"675\" height=\"371\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/11\/afd0f28f47c8870683af4a4d85abf62f-300x165.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/11\/afd0f28f47c8870683af4a4d85abf62f.jpg 666w\" sizes=\"auto, (max-width: 675px) 100vw, 675px\" \/><\/a><\/p>\n<p>When light tries to pass from water into air, if the angle is shallow enough, the boundary acts just like a <b>mirror<\/b> and reflects all the light back inside. <b>Real fiber optic cables are precision-engineered to keep this reflection going indefinitely<\/b>, allowing information to travel for many miles.<\/p>\n<p>Conversely, if the angle is too steep (closer to perpendicular), the light will pass right through the wall and escape. This is called &#8220;<b>refraction<\/b>.&#8221;<\/p>\n<p><a href=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/11\/6d6aabc03143363a1467fb425c65f8f2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-23203 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/11\/6d6aabc03143363a1467fb425c65f8f2-300x187.jpg\" alt=\"Screenshot 2015-11-22 7.29.39\" width=\"534\" height=\"333\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/11\/6d6aabc03143363a1467fb425c65f8f2-300x187.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/11\/6d6aabc03143363a1467fb425c65f8f2.jpg 487w\" sizes=\"auto, (max-width: 534px) 100vw, 534px\" \/><\/a><\/p>\n<p>Learning Through Experience<br \/>\nBefore diving into textbook diagrams or solving formulas, I want you to experience that &#8220;<b>feeling of controlling and trapping light<\/b>&#8221; for yourself. Witnessing a phenomenon with your own eyes is often the spark that ignites a lifelong passion for physics.<\/p>\n<p>For this experiment, make sure to use a <b>clear<\/b> umbrella bag (like the ones found at supermarkets on rainy days\u2014just be sure to ask for permission first!). If you want to try this on a larger scale, you can pick up a bulk pack of bags from a packaging specialist.<\/p>\n<p>For those who want to dive deeper, I\u2019ve explained &#8220;total internal reflection&#8221; and &#8220;critical angles&#8221; in this video lesson. Check it out!<\/p>\n<p><iframe loading=\"lazy\" title=\"\u5168\u53cd\u5c04\u3068\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u304c\u30d4\u30ab\u30d4\u30ab\u3072\u304b\u308b\u7406\u7531!?\u3010\u9ad8\u6821\u7269\u7406 \u5b9f\u9a13+\u30d7\u30ea\u30f3\u30c8\u3042\u308a\u3011\" width=\"1140\" height=\"641\" src=\"https:\/\/www.youtube.com\/embed\/CPBeRGV_6N0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Why do diamonds sparkle so brilliantly? Why is it hard to see the sky clearly from underwater? All of these everyday mysteries are connected through total internal reflection. Why not take a look at the world through the eyes of a scientist?<\/p>\n<p>Inquiries and Requests<br \/>\nLet&#8217;s make the wonders of science a part of your everyday life! I\u2019ve put together many fun and easy experiments you can do at home. Feel free to explore!<\/p>\n<p>\u30fbThe &#8220;Science Material Box&#8221; is now a book! Details <a href=\"https:\/\/amzn.to\/42PMCEL\">here<\/a> \u30fbLearn more about the author, Ken Kuwako <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=37\">here<\/a> \u30fbFor inquiries (writing, speaking, workshops, TV supervision, etc.), click <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">here<\/a> <span class=\"s2\">\u30fbGet the latest updates on <a href=\"https:\/\/x.com\/kuwako\">X (formerly 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> Check out more experiments on the <a href=\"https:\/\/www.youtube.com\/user\/kkuwako?sub_confirmation=1\">Science Material Channel<\/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 style=\"text-align: center;\"><strong>Explore<\/strong><\/h3>\r\n<ul>\r\n<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=30764\">\u697d\u3057\u3044\u5b9f\u9a13<\/a>\u2026\u304a\u5b50\u3055\u3093\u3068\u4e00\u7dd2\u306b\u5922\u4e2d\u306b\u306a\u308c\u308b\u30a4\u30c1\u30aa\u30b7\u306e\u79d1\u5b66\u5b9f\u9a13\u3092\u591a\u6570\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u9ad8\u6821\u7269\u7406\u306e\u7406\u89e3\u3092\u6df1\u3081\u308b\u305f\u3081\u306e\u52d5\u753b\u6559\u6750\u3082\u7528\u610f\u3057\u307e\u3057\u305f\u3002<\/li>\r\n<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=798\">\u7406\u79d1\u306e\u6559\u6750<\/a>\u2026 \u7406\u79d1\u6559\u5e2b\u3092\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\uff01\u6388\u696d\u306e\u8cea\u3092\u9ad8\u3081\u3001\u6e96\u5099\u3092\u52b9\u7387\u5316\u3059\u308b\u305f\u3081\u306e\u9078\u308a\u3059\u3050\u308a\u306e\u6559\u6750\u3092\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\r\n<li><a href=\"https:\/\/www.youtube.com\/c\/kkuwako\">Youtube<\/a>\u2026\u79d1\u5b66\u5b9f\u9a13\u7b49\u306e\u52d5\u753b\u3092\u914d\u4fe1\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\r\n<li><a href=\"https:\/\/music.youtube.com\/playlist?list=PLoK4ZvKN9S2NgpYIochcQs0aL-vrRB_Qw\">\u79d1\u5b66\u30e9\u30b8\u30aa<\/a>\u00a0\u2026\u79d1\u5b66\u30c8\u30d4\u30c3\u30af\u3092\u307b\u307c\u6bce\u65e5\u914d\u4fe1\u4e2d\uff01AI\u6280\u8853\u3092\u99c6\u4f7f\u3057\u3066\u4f5c\u6210\u3057\u305f\u300c\u8033\u3067\u697d\u3057\u3080\u79d1\u5b66\u300d\u3092\u304a\u5c4a\u3051\u3057\u307e\u3059\u3002<\/li>\r\n<li><a href=\"http:\/\/phys-edu.net\/wp\/?page_id=20940\">\u8b1b\u6f14<\/a>\u00a0\u2026\u5168\u56fd\u5404\u5730\u3067\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\u30fb\u30b5\u30a4\u30a8\u30f3\u30b9\u30b7\u30e7\u30fc\u7b49\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/li>\r\n<li><a 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>I am Ken Kuwako, your science trainer. Every day is an experiment! In my last post, we used a simple umbrella  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":23201,"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":[781],"tags":[],"class_list":["post-54896","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-en"],"jetpack_featured_media_url":"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/11\/b98ba2070acd2688fa90d38c39057bb1.jpg","jetpack-related-posts":[{"id":55754,"url":"https:\/\/phys-edu.net\/wp\/?p=55754&lang=en","url_meta":{"origin":54896,"position":0},"title":"The Alligator&#8217;s Secret Mirror: How Total Internal Reflection Connects Aquariums and the Internet","author":"\u6851\u5b50 \u7814","date":"2025\u5e7411\u670811\u65e5","format":false,"excerpt":"I'm Ken Kuwako, your Science Trainer. Every day is\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/DSC03830.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/DSC03830.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/DSC03830.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/DSC03830.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/DSC03830.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":55892,"url":"https:\/\/phys-edu.net\/wp\/?p=55892&lang=en","url_meta":{"origin":54896,"position":1},"title":"Easy Home Science! Project an \u201cUpside-Down World\u201d on Your Wall \u2014 The Magic of Lenses and Light","author":"\u6851\u5b50 \u7814","date":"2025\u5e7411\u670814\u65e5","format":false,"excerpt":"I\u2019m Ken Kuwako, a Science Trainer. Every Day is an\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2014-01-30 21.02.11","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2014\/01\/20d7ef28c6cfe82391d850c34d96c8b21.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":54711,"url":"https:\/\/phys-edu.net\/wp\/?p=54711&lang=en","url_meta":{"origin":54896,"position":2},"title":"Jam&#8217;s Secret Ingredient: The Magical Pectin Science on Your Toast!","author":"\u6851\u5b50 \u7814","date":"2025\u5e7410\u670821\u65e5","format":false,"excerpt":"I'm Ken Kuwako, your Science Trainer, and for me, \u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/10\/%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%88-2025-10-21-4.33.35.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/10\/%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%88-2025-10-21-4.33.35.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/10\/%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%88-2025-10-21-4.33.35.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/10\/%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%88-2025-10-21-4.33.35.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":52909,"url":"https:\/\/phys-edu.net\/wp\/?p=52909&lang=en","url_meta":{"origin":54896,"position":3},"title":"Science at Minnie\u2019s House!? The Magical Physics of the Volumatronics at Disneyland","author":"\u6851\u5b50 \u7814","date":"2025\u5e749\u670823\u65e5","format":false,"excerpt":"I'm Ken Kuwako, a science trainer! Every day is an\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/d569ab47826e1ac376104e9818a70fac.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/d569ab47826e1ac376104e9818a70fac.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/d569ab47826e1ac376104e9818a70fac.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/d569ab47826e1ac376104e9818a70fac.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":51690,"url":"https:\/\/phys-edu.net\/wp\/?p=51690&lang=en","url_meta":{"origin":54896,"position":4},"title":"The Big Bang: When Hydrogen and Oxygen Ignite! A Dazzling Chemical Reaction That&#8217;ll Blow Your Mind.","author":"\u6851\u5b50 \u7814","date":"2025\u5e749\u67087\u65e5","format":false,"excerpt":"I'm Ken Kuwako, a science trainer. Every day is an\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/4498209cbf3d5872b78acfe6b1d24db5.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/4498209cbf3d5872b78acfe6b1d24db5.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/4498209cbf3d5872b78acfe6b1d24db5.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/05\/4498209cbf3d5872b78acfe6b1d24db5.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":61959,"url":"https:\/\/phys-edu.net\/wp\/?p=61959&lang=en","url_meta":{"origin":54896,"position":5},"title":"Style Meets Science! Choose Clothes That Beat Static with the Triboelectric Series","author":"\u6851\u5b50 \u7814","date":"2026\u5e743\u670830\u65e5","format":false,"excerpt":"I'm Ken Kuwako, your Science Trainer. Every day is\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"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%88-2026-01-18-7.17.49.jpeg?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%88-2026-01-18-7.17.49.jpeg?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%88-2026-01-18-7.17.49.jpeg?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%88-2026-01-18-7.17.49.jpeg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=\/wp\/v2\/posts\/54896","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=54896"}],"version-history":[{"count":0,"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=\/wp\/v2\/posts\/54896\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=\/wp\/v2\/media\/23201"}],"wp:attachment":[{"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=54896"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=54896"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=54896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}