Her mouth is open for visitors to glimpse three full rows of serrated teeth ... “A mako shark would look puny next to a megalodon,” says Sues. But the fish is still large by human standards ...

but that “both teeth and taste buds develop from the same stem cells in an embryonic shark’s mouth.” The findings, and findings like it, might offer promising advances for human dentistry.

They are large-bodied and display a mouthful of sharp teeth that protrude in all directions, even when the mouth is ... to attack humans only when bothered first. Sand tiger sharks are brownish ...