『You'll Know Why』のカバーアート

You'll Know Why

You'll Know Why

著者： You'll Know Why
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10月19日まで。※適用条件あり
Why does your body do that? Why does the world work this way? You'll Know Why turns surprising questions about science, psychology, history, technology, money, and everyday life into short, clear stories you can understand in minutes — and repeat to someone else later. One question. One explanation. One thing you'll never look at the same way again.You'll Know Why
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  • Why AMBULANCE Is Written Backwards

    Why AMBULANCE Is Written Backwards
    2026/10/05

    A mirror is going to flip the word anyway, so somebody flipped it first and let the two reversals cancel out. The driver ahead reads it in the one second where it counts. Try writing your own name in mirror image with nothing to copy from: reading one is far easier than making one.

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    1 分
  • Why Clock Hands Turn the Way They Do

    Why Clock Hands Turn the Way They Do
    2026/10/04

    Nobody voted on this. The direction comes from a stick pushed into the ground, and the shadow it threw across the northern hemisphere for centuries before any gear existed. Set the same sundial up in the southern hemisphere and it runs the other way, which is the fully checkable part.

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    2 分
  • Why Manhole Covers Are Round

    Why Manhole Covers Are Round
    2026/10/03

    A square cover, turned and tipped on its diagonal, drops straight into its own hole, because that diagonal runs about forty percent longer than a side. A circle is the same width from every angle, so falling in isn't unlikely, it's impossible. And the circle is not the only shape that manages it.

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    1 分
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