How Does Light Travel?
You've learned that light lets us see across billions of years. But understanding how light itself actually works took centuries of curiosity and clever experiments.
Seeing Is Not Simple
You look at something and you see it. It feels instant and obvious. But for most of human history, nobody could actually explain how seeing works. Working it out took one of history's simplest and cleverest experiments.
To find out why this question stumped people for so long, tap the Expert Tap.
Who Discovered How Light Works?
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What did the image on the wall prove about light?
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