But why is a sphere's surface area four times its shadow? [video]

Article URL: https://www.youtube.com/watch?v=GNcFjFmqEc8

Comments URL: https://news.ycombinator.com/item?id=18584458

Points: 90

# Comments: 39

from Hacker News: Front Page https://www.youtube.com/watch?v=GNcFjFmqEc8
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