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About 9 million years ago, marine worms burrowed into a dead fish's head and left behind a skull full of fossilized poop.

Remarkably, when feces fossilize, they are known as coprolites. The term coprolite comes from the Greek words kopros (meaning dung) and lithos (meaning stone). To celebrate the importance of coprolites in the fossil record and in the study of prehistoric life, the Department of Paleontology at the Calvert Marine Museum (CMM) is initiating the celebration of Universal Coprolite Day, recognized every year henceforth on February 22.

The two companies that will emerge from the approaching separation of Exelon Generation's regulated utility and competitive energy businesses have set out their respective plans at separate analyst events this week. Exelon will become the USA's largest transmission and distribution utility serving some 10 million customers across seven different regulatory jurisdictions. Constellation will be the largest producer of carbon-free electricity in the country.

Approximately 23 to 3.6 million years ago, the now extinct species of mackerel shark known as the Megalodon or 'Big Tooth', existed as the world's largest shark and fish that ever lived.

Fossilised shark vertebrae found within the US have provided rare evidence of ancient shark-on-shark battles.