拆解 — everywhy.ai2026-07-02T00:00:00Zhttps://everywhy.ai/筷子插进水里，为什么弯了？https://everywhy.ai/pages/light-refraction.html2026-07-02T00:00:00Z把「看见」拆成三个零件：光从筷尖出发、在水面拐弯、眼睛沿直线反推——拼回去，弯筷子自己浮现。Why does a chopstick look bent in water?https://everywhy.ai/pages/light-refraction-en.html2026-07-02T00:00:00ZTake seeing apart into three pieces: light leaves the tip, bends at the surface, and your eye traces it straight back — reassemble them and the bend appears.为什么是 3-4-5？https://everywhy.ai/pages/pythagorean-theorem.html2026-07-02T00:00:00Z四个一样的直角三角形，在同一个大正方形里换个摆法：中间的洞从 c² 变成 a² + b²——勾股定理自己浮现。τ — one full turnhttps://everywhy.ai/pages/tau-sweep.html2026-06-30T00:00:00ZSweep a radius through one full turn and watch both 2πr and πr² appear.A circle's area hides a little secrethttps://everywhy.ai/pages/circle-area-for-kids-en.html2026-06-30T00:00:00ZThe same proof, told for kids — scroll to cut, zip, and rebuild the circle.圆的面积，藏着一个小秘密https://everywhy.ai/pages/circle-area-for-kids.html2026-06-30T00:00:00Z把圆切成小块，拼成长方形，亲眼看看 πr² 是怎么来的。Why is a circle's area πr²?https://everywhy.ai/pages/circle-area-proof.html2026-06-28T00:00:00ZSlice the circle into wedges, rearrange them into a rectangle, and watch πr² fall out.