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Balloting of a patella

Balloting of a patella (patella natans) – a sign of the available liquid in a cavity of a knee joint: at the straightened leg pressing a patella leads to its immersion in a joint cavity against the stop in the surface of a bone, after the termination of pressure the patella "emerges".

 
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In our intestines are born, millions of bacteria live and die. They can be seen only at strong increase, but if they gathered, then would be located in a usual coffee cup.