Why Does Being in the Sun Make You So Tired?

The beach is nice, but why does spending time out in the sun leave us feeling so exhausted?

Hosted by: Hank Green

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Sources:

https://www.istockphoto.com/photo/man...
https://www.istockphoto.com/photo/bac...
https://www.storyblocks.com/video/sto...
https://www.istockphoto.com/photo/fee...
https://www.istockphoto.com/photo/wat...
https://www.istockphoto.com/photo/sun...
https://www.istockphoto.com/vector/gr...
https://www.istockphoto.com/photo/man...