You may recently have heard about the suffering caused by cholera, an infectious disease that can kill anyone but as with most infectious diseases is deadliest to the the youngest and the oldest. There’s an epidemic of it in Yemen, and the real cause of it is war.

I’m obviously guilty of posting a lot of videos from the brothers John and Hank Green, but they both have a gift for explaining complex subjects quickly and in a way that is both informative and humane. Here’s John Green, the older brother and novelist, laying out the key facts about the current cholera crisis in just under four minutes:

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