Interesting facts about sharks.

1. Sharks don't feel pain. 2. The eye of a shark can perceive almost twice as many frames per second as the human eye. 3. Sharks are able to feel the blood diluted in sea water in a ratio of one to a million. Yes, they do have a very, very keen sense of smell. 4. Sharks can't sleep. The fact is that they can pass water through the gills, taking oxygen from it, only in the process of swimming, since shark gills at rest cannot “suck in” water themselves. Thus, sharks never sleep, otherwise they will simply suffocate. 5. There is a place in the central part of the Pacific Ocean where large groups of white sharks regularly gather. It bears the informal name "Shark Cafe".