nervous system

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upside down photo
For the past two days, I have been suffering from vertigo, trying to get my body to remember which way is up. What causes vertigo?

Contagious Yawns

This experiment is a chance for you to do some scientific research on a problem that has never been solved. We all yawn, and you have probably noticed that if someone else yawns, you do too. Why? There are several hypotheses, but none has enough solid evidence to become an accepted theory.

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