Why
Principles
Why things work the way they do — the principle behind the phenomenon.
Why Is Ice Slippery?Ice isn't slippery because of melted water or pressure — it's the quasi-liquid layer, where surface molecules vibrate freely.Why Does a Mirror Reverse Left and Right?A mirror reverses neither left-right nor up-down — only front-back (the z-axis). "Left-right reversal" is an illusion born from mentally rotating the image to face us.Why Is a Rainbow Arc-Shaped?A rainbow is not an object in space but a cross-section of a 42° cone centered on the observer. That is why it is an arc, why it moves with you, and why your neighbor sees a different rainbow.
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