Earth Day: Why do sharks visit Israel's Hadera stream?
Dusky and Sandbar sharks visit Israel every winter, for a reason scientists are still trying to figure out.
Children watch sharks swim above them in a glass tunnel at the Sydney Aquarium, Australia, September 29, 2015. Shark experts from around the world are meeting at a summit in Sydney today to discuss the best technologies available to stop shark attacks after a numerous attacks and sightings this year(photo credit: DAVID GRAY / REUTERS)
