https://haccha-meccha.com/en/Data, math and science, checked with videos and hands-on experimentsenhttps://haccha-meccha.com/en/toukei/07/https://haccha-meccha.com/en/toukei/07/Mon, 09 Nov 2026 06:00:00 +0900At 61 stations in Japan with records from 1910, days at 95°F (35°C) or more became columns on a 3D map for 117 years: 1.2 to 10.3 days a year, and a record tha…https://haccha-meccha.com/en/oto/05/https://haccha-meccha.com/en/oto/05/Mon, 09 Nov 2026 05:00:00 +0900One hour of pencil writing with quiet after-school library and distant schoolyard sounds, no narration or music. The sun sets at a real sunset's pace; on the w…https://haccha-meccha.com/en/moshimo/07/https://haccha-meccha.com/en/moshimo/07/Sun, 08 Nov 2026 06:00:00 +0900Place the Moon at half its average distance and test two starting speeds. Explore the orbit, apparent size and differential pull.https://haccha-meccha.com/en/hirameki/08/https://haccha-meccha.com/en/hirameki/08/Sun, 08 Nov 2026 05:00:00 +0900Order big numbers by lining them up in a place-value chart and comparing from the left. Grade 4 video, activity, guide.https://haccha-meccha.com/en/meisaku/14/https://haccha-meccha.com/en/meisaku/14/Sat, 07 Nov 2026 09:00:00 +0900I Am a Cat: plot, characters, all eleven chapters, the mochi mishap, and the ending, with reading links.https://haccha-meccha.com/en/meisaku/17/https://haccha-meccha.com/en/meisaku/17/Sat, 07 Nov 2026 06:00:00 +0900The Nighthawk Star: plot, ending, and questions about Yodaka’s fear, the lives he takes, and his final blue light.https://haccha-meccha.com/en/meisaku/13/https://haccha-meccha.com/en/meisaku/13/Sat, 07 Nov 2026 05:00:00 +0900Dazai’s One Hundred Views of Mount Fuji: plot summary and ending — a photo in fog, a primrose, a last shutter.https://haccha-meccha.com/en/shikumi/06/https://haccha-meccha.com/en/shikumi/06/Fri, 06 Nov 2026 09:00:00 +0900See how star arrangements, metals, and layers create the shapes and changing colors of fireworks.https://haccha-meccha.com/en/chizu/07/https://haccha-meccha.com/en/chizu/07/Fri, 06 Nov 2026 06:00:00 +0900Animated world transport: canals, containers, and illustrative sea, air and land connections from 195 countries.https://haccha-meccha.com/en/chizu/06/https://haccha-meccha.com/en/chizu/06/Fri, 06 Nov 2026 05:00:00 +0900Are Japan's cherry blossoms opening earlier? JMA first flowering dates from 1953 to 2026 move across a map, and two 30-year averages are compared site by site.https://haccha-meccha.com/en/moshimo/06/https://haccha-meccha.com/en/moshimo/06/Thu, 05 Nov 2026 09:00:00 +0900Drop a ball through Earth. Its interior, spin and air change the destination. Explore the calculation and try your own city.https://haccha-meccha.com/en/meisaku/12/https://haccha-meccha.com/en/meisaku/12/Thu, 05 Nov 2026 07:00:00 +0900Takasebune by Mori Ōgai: a plot summary, its ending, Kisuke’s 200 mon, and the constable’s unresolved doubt.https://haccha-meccha.com/en/reverse/05/https://haccha-meccha.com/en/reverse/05/Thu, 05 Nov 2026 06:00:00 +0900Rewind a blue LED's gallium through the chip, reactor, refinery, a sea voyage, and a red mine. Route table and sources.https://haccha-meccha.com/en/meisaku/11/https://haccha-meccha.com/en/meisaku/11/Thu, 05 Nov 2026 05:00:00 +0900Motojirō Kajii's Lemon: the fruit shop, the gloom inside Maruzen, the book castle, and the daydream after he leaves.https://haccha-meccha.com/en/meisaku/10/https://haccha-meccha.com/en/meisaku/10/Wed, 04 Nov 2026 06:00:00 +0900Akutagawa's Toshishun: two fortunes, a vow of silence on Mount Emei, his parents in hell, and his mother's words.https://haccha-meccha.com/en/illusion/08/https://haccha-meccha.com/en/illusion/08/Wed, 04 Nov 2026 05:00:00 +0900Explore shaded discs, the Necker cube, and spinning rings, then test depth in interactive experiments.https://haccha-meccha.com/en/hirameki/07/https://haccha-meccha.com/en/hirameki/07/Tue, 03 Nov 2026 06:00:00 +0900How many millions make one billion? Bundle sticks of one million by tens and watch the 1 cross into the Billions. A Grade 4 place-value lesson.https://haccha-meccha.com/en/hirameki/05/https://haccha-meccha.com/en/hirameki/05/Tue, 03 Nov 2026 05:00:00 +0900How do you write three hundred thousand, fifty in digits? A Grade 4 lesson on the zeros you never hear.https://haccha-meccha.com/en/chizu/05/https://haccha-meccha.com/en/chizu/05/Mon, 02 Nov 2026 06:00:00 +0900Many of Kyoto's famous sights lie outside Heian-kyo, the capital laid out in 794. A map fast-forwards 1,200 years to show where they appeared and why.https://haccha-meccha.com/en/oto/04/https://haccha-meccha.com/en/oto/04/Mon, 02 Nov 2026 05:00:00 +0900An autumn night music room with a closed piano, autumn leaves outside, and sounds of gentle piano, insects and wind in the trees. It runs for one hour, repeati…https://haccha-meccha.com/en/toukei/06/https://haccha-meccha.com/en/toukei/06/Sun, 01 Nov 2026 09:00:00 +0900Android has ~70% of mobile web views worldwide, iOS ~60% in Japan. A monthly bar chart race shows when they split.https://haccha-meccha.com/en/shikumi/05/https://haccha-meccha.com/en/shikumi/05/Sun, 01 Nov 2026 06:00:00 +0900How does the blue dot find you? Satellites only broadcast time and position. Your phone turns travel time into distance and fixes its own clock with a fourth s…https://haccha-meccha.com/en/illusion/07/https://haccha-meccha.com/en/illusion/07/Sun, 01 Nov 2026 05:00:00 +0900Three vanishing illusions (Ninio's extinction illusion, Troxler fading, motion-induced blindness) checked with pixels and measurement.https://haccha-meccha.com/en/meisaku/09/https://haccha-meccha.com/en/meisaku/09/Sat, 31 Oct 2026 09:00:00 +0900Mori Ōgai's Maihime: Toyotarō in Berlin, Elise the dancer, three yeses to other men, and the last line.https://haccha-meccha.com/en/scale/05/https://haccha-meccha.com/en/scale/05/Sat, 31 Oct 2026 06:00:00 +0900Compare the depths of lakes from Japan to Lake Baikal with Tokyo Tower, in true-to-scale 3D built from real terrain and lakebed data.https://haccha-meccha.com/en/reverse/04/https://haccha-meccha.com/en/reverse/04/Sat, 31 Oct 2026 05:00:00 +0900Rewinding the bead inside a Japanese Akoya pearl leads from a workshop in Japan across the Pacific to freshwater mussels in American rivers. With a route table…https://haccha-meccha.com/en/hirameki/04/https://haccha-meccha.com/en/hirameki/04/Fri, 30 Oct 2026 09:00:00 +0900Are 12 million 500 thousand and 12,500 thousand the same? Grade 4 place value with millions: video, activity, and guide.https://haccha-meccha.com/en/chizu/04/https://haccha-meccha.com/en/chizu/04/Fri, 30 Oct 2026 08:00:00 +0900Almost all of Flevoland's land was seabed 100 years ago. Watch the Zuiderzee become a lake and then polders, from a 1905 sea chart to today's ground heights.https://haccha-meccha.com/en/scale/06/https://haccha-meccha.com/en/scale/06/Fri, 30 Oct 2026 07:00:00 +0900Six dinosaurs lined up at the same scale against a bicycle, comparing estimated total length and then body weight. Are longer dinosaurs heavier?https://haccha-meccha.com/en/hirameki/03/https://haccha-meccha.com/en/hirameki/03/Fri, 30 Oct 2026 06:00:00 +0900How many thousands make a million? Stack thousand cubes, watch the carry in a place-value chart, and try it yourself.