You may have heard rumours that deodorants and antiperspirants could cause breast cancer. But these concerns were started by an e-mail hoax. There is no convincing evidence that antiperspirants and deodorants cause breast cancer. Why are the claims about deodorants and breast cancer wrong? The original e-mail claimed that antiperspirants stop your body from sweating out poisons. It suggested that these toxins build up in the lymph glands under the arm and cause breast cancer.
Sharks Have Been Around For Longer Than Trees. The earliest sharks swam through Earth's oceans around 420 to 450 million years ago, a time when there were no true trees on land. Paleontologists can trace the history of sharks this far back by examining fossilized shark teeth and scales.
Evidence of How Long Sharks Have Been Around. Sharks have lived in the Earth's oceans for as many as 450 million years -- long before dinosaurs roamed on land. These ancient creatures have adapted to survive five mass extinctions. The earliest sharks probably didn't look much like modern sharks, and they stayed close to shore in search of prey.