What causes headaches?

In ancient Greece, the best-known remedy for a long-standing headache was to drill a small hole in the skull to drain supposedly infected blood. Fortunately, doctors today don’t resort to power tools to cure headaches, but we still have a lot to learn about this ancient ailment. Dan Kwartler shares what we know about headaches.
Lesson by Dan Kwartler, animation by Sharon Colman.

[Via: ed.ted.com]

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