Mermaids — legendary half-human, half marine creatures — have fascinated people for centuries and inspired many "sightings."
Artifacts found in Japan may be ninja weapons, including several that look like they were the forerunners to the well-known throwing star.
From lightning to space rocks, here are ideas for how the first life on Earth came to be.
A cone-shaped skull with a possible metal implant could represent some of the earliest evidence from Peru of a surgical implant. Or it could be a modern-day fake.