Weird but true shark facts

Sharks can sense a drop of blood from 2.5 miles away. They can detect one part of blood in 100 million parts of water.
Sharks are so powerful that their bite can generate a force of up to 6 tons per square inch.
Sharks, in their 400 million years on earth, have shown an extraordinary ability to resist cancer and other diseases. This has raised hopes among medical researchers that the oceans’ most feared predator might turn out to be the cancer patient’s best friend. Investigators continue to study the immune system of sharks to see if it can provide the answer to stopping the spread of cancer in humans.
The biggest shark is the whale shark which can be up to 50 feet (15 m) long. Sharks can live up to 100 years !!!