Fingerprints are those little ridges on the tips of your fingers. They’re essentially folds of the outer layer of skin, the epidermis. The “prints” themselves are the patterns of skin oils or dirt ...

An Old Babylonian clay hand tablet (circa 1800–1600 BCE) from the Yale Babylonian Collection that was likely used as a practice school exercise by a new scribe and a fingerprint of the scribe was left ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to ...