Under this theory, the superego acts as a restraint.

VOA: special.2010.04.13

This would support a theory that the fish became poisoned in coastal waters before entering the harbor.

VOA: special.2011.03.15

One theory is that the shape developed over the ages to improve this shark's sense of smell.

VOA: special.2010.08.03

Some other experts reject this erosion theory.

VOA: special.2009.08.17