You may have heard of Hank Green, arguably Youtube’s number one science-geek and brother  of author John Green who’s books have turned on the waterworks for millions. So, why do we cry? Well, ultimately it depends on our situation. Humans have three different types of tears; basil, reflex and emotional. The latter is the most interesting as many researchers maintain we are the only animals capable of them, but why?

Onions, Emotions, and Why We Cry | SciShow

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