Marisa Sloan

Whether you’ve invested money, time or effort, learn how to recognize and overcome the sunk cost fallacy.

Though useful for all sorts of things, it’s safe to say humans didn’t evolve to have fingerprints to unlock smartphones or catch criminals — at least, not originally.

Evidence of these Ice Age carnivores is extremely rare in the eastern U.S., but drought has revealed fossils of the American lion in the Mississippi.

Was this hand grenade used during the Crusades? If so, it’s merely the latest in a long line of medieval incendiary devices.

Found in King Tut’s tomb, the weapon’s origin and how it was made has confused researchers since it was forged from an iron meteorite.

Throughout the animal kingdom, creatures have multiple reasons to keep an ear out for valuable intel — even from different species.

Batten down the hatches! Will a rusticle forming bacteria called Halomonas titanicae completely disintegrate the Titanic shipwreck within our lifetime?

Ridden with gastrointestinal problems as they trekked across the continent, the Corps of Discovery was a big fan of popping mercury pills. Present-day archaeologists are still searching for evidence of the element in their excrement.

A clock in the antennae and a “sun compass” in the brain help guide these butterflies on their 2,000-mile trek to Mexico.

The queen’s messages, once redacted by an unknown censor, shed light on her close relationship with a Swedish count during the French Revolution.