White sharks are being spotted off the Pacific coast more than ever before. A 2014 study found that, at minimum, California's shark population now exceeds 2,000. And the California Department of Fish and Wildlife reports that since 1950, there's been at least 158 documented cases where a shark approached a person in the water, 44 of which occurred since 2010. Those numbers are at best rough estimates -- tracking shark encounters is an imperfect science largely reliant on first-hand reports. But members of Salesforce's Einstein AI team and oceanographers at the University of California's nonprofit Benioff Ocean Initiative say they've developed a better solution in a system that susses out great whites from drone footage.