The woman was reportedly a marathon runner and on vacation, celebrating her graduation from yale. it is not clear what type of shark bit her. officials on the islands say shark encounters there are rare. well, as we get into the summer season, people are spending more time in the ocean and beneath the surface, in some areas, our great white sharks. researchers are now on the verge of learning more about the mysterious creatures in this week's "eye on america," cbs's carter evans joins a group of scientists on a research ship in the atlantic ocean is a zero in on the apex predators. >> reporter...