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.
History of Sharks: The Devonian Period. The history of sharks goes back a long time. But the term âa long timeâ doesnât even begin to cover it. Letâs put it this way: dinosaurs lived during the Mesozoic Era, which began about 245 million years ago. Sharks, on the other hand, were living on the planet 200 million years before dinosaurs!