What Do Food Expiration Dates Actually Mean?

SciShow:

Sell By, Best By, and Use By… do these dates actually tell you anything? Food science can be tricky, but we’re here to clear some of it up.

 

 

Will Stress Really Make You Go Gray?

Does stress really make your hair go gray faster?

Just like the myth that plucking one gray hair will make three sprout, stress making your hair white isn’t actually a thing. Or is it?!

 

 

How Seashells Are Made

If you know that seashells are made of basically the same stuff as chalk, you might have wondered why chalk is crumbly but seashells are super tough. Reactions explains the secret’s in the biochemistry.

 

 

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