The difference between the two is amazing. The first image is of the jawbone of Megalodon which if memory serves, is a prehistoric Great White. I just thought that some might find the comparison interesting.
Yeah well, when times get tougher the prey gets smaller and predators have to downsize to adapt. Those Icthyosaurs the Megaladons fed on are pretty hard to find these days. The world has gotten a little more 'boring'.