THIS Is why flight attendants tell you to secure YOUR mask before helping others

July 23, 2016

You've heard the flight attendant say this before: "Secure your own mask before helping others." But why?

Hypoxia sets in.

In this video, Destin Sandlin of Smarter Every Day demonstrates what happens to your brain when you lose oxygen at high altitudes and how important putting your mask on first truly is.

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