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Berger sign

Berger sign (Е. Berger, the Austrian ophthalmologist, 1855-1926) – noted at a general paralysis and tabes dorsalis (a back to tabes) an elliptic form of pupils.

 
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Was considered earlier that yawning enriches an organism with oxygen. However this opinion was disproved. Scientists proved that yawning, the person cools a brain and improves its working capacity.