An alarming message about deodorant use and breast cancer began circulating on the Internet in the 1990s, spread via e-mail and message-board postings. It continues to resurface now and again and causes a great deal of concern about the safety of items many of us use every day. So let's take a look at the evidence.
How long have sharks been in existence? A: Geological records show that modern shark species have existed for between 201 million and 174 million years. Earlier fish species similar to sharks existed as early as between 419 million and 359 million years ago.
In captivity, whale sharks are not quite happy as in few cases they have died within days, but at most they have reached only 8 years. Some scientists believe that the life expectancy of the Great White Sharks is around 30 years (Levine, 1988) but other research indicates that they can reach up to 40 years. The lifespan of Tiger Sharks in the wild is believed to be 27 years in average, although some may live up to 50 years of age. Like with other species, tiger sharks in captivity do not live as lengthy as in wildlife reaching only 17 to 20 years.