By using special satellite tracking devices attached to the fish via darts, scientists have discovered great white sharks congregate in large numbers quite near the central and north California coasts during certain times of the year. Considering some of their primary prey items are seals and sea lions, which northern California has in abundance, I'm surprised it's taken them this long to make the discovery. Then again, it speaks well for just how small the danger is of humans being attacked by one of these sea-going predators.