Number 3309 from that site:

Great White Sharks have seven senses. They can detect minute electrical charges eg from a seal's muscle contraction - using jelly filled canals in the head, called ampullae of Lorenzini. They can also detect changes in water pressure. They are also able to feel vibrations in the water using a line of canals that go from their head to tails. Called a "lateral line", these canals are filled with water and contain sensory cells with hairs growing out of them. These hairs move when the water vibrates and alerts the shark to potential prey.