People used it to paint objects, on cave walls and even to decorate their bodies. “There have been some experimental tests that show it has sunscreen-like properties. It’s a pretty effective ...

This naturally occurring pigment, rich in iron oxide, has long been used by human ancestors to decorate skin, tools, and cave walls. But experiments have shown that ochre also blocks ultraviolet ...

Every fall, these big brown bats (Eptesicus fuscus) squeeze their furry bodies into nooks in the cave walls, where they enjoy protection from the bitter wind and the waterfall that sprays across ...