Why is the sky blue?
Markers draw the sun, a light wave and an air molecule that scatters blue light in every direction; the camera moves on to "scattering ∝ 1/λ⁴", compares blue 450 nm with red 700 nm and circles about 6×.
Whiteboard Explainer16:9 · 30fps · 10.0s · en/US
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Example request
A whiteboard explainer of why the sky is blue: sunlight hits air molecules and short blue wavelengths scatter more; write scattering ∝ 1/λ⁴, blue 450 nm vs red 700 nm, blue scatters about 6 times more.