Thanks to modern-day genome sequencing technology, we now know more about Japan's ancient world than ever before — and all because of a tooth.

Thanatotheristes degrootorum, "Reaper of Death" in Greek, is a tyrannosaur that lived about 79 million years ago, which pushes the tyrannosaur family's history back by about 10 million years.

By analyzing 103 skulls of early Caribbean inhabitants, experts were able to reassess when and where they settled — lent credence to Columbus' infamous tales of cannibalism.

"This is what evolutionary biologists predicted. It’s really exciting that what we have found lines up so neatly with their prediction."

Conservation International's Rapid Assessment Program spent three weeks traversing the rainforests of Honduras, discovering and documenting hundreds of species — and some are entirely new to science.

Fossilized evidence of a now-extinct primate species suggests prehistoric monkeys traveled more than 900 miles on natural rafts.

There are around 1,200 archaeological sites on Gran Canaria in the Canary Islands. This one, however, contained the remains of aboriginal Guanche newborns.

Items found with the skeletons — including iron arrowheads, horse harnesses, and a broken vase — helped researchers trace back the burial to the 4th century B.C.

After three months of beating and starving 16-year-old Sylvia Likens — and getting her children and neighborhood kids to help — Gertrude Baniszewski viciously murdered her on October 26, 1965.

Lost continents continue to be discovered as the technology to study our ever-shifting tectonic plates grows more advanced.

Ottis Toole was convicted of committing six murders between 1980 and 1983, but he admitted to killing more than 100 victims, including Adam Walsh, the six-year-old son of America's Most Wanted host John Walsh.