A shark expert, whose own curiosity about these fascinating fish was sparked by the movie "Jaws," explains some of their unique features and the many discoveries made in the decades after its release.

When “Jaws” debuted in U.S. theaters 50 years ago today, it helped launch a new era in American movies. Steven Spielberg’s blockbuster about a bloodthirsty great white terrorizing a beach town also stoked fear and fascination, exacting a toll on sharks.

The toothy villain of “Jaws” terrified audiences in 1975. Offscreen, the hit film — which is celebrating its 50th anniversary — impacted sharks in unexpected ways.