Let’s start with some basic biology: in the nucleus of a human cell, each DNA molecule is packed into a long thread called a chromosome. Most human cells contain 23 pairs of chromosomes, with one half ...

A child went missing in Pawtucket, R.I., in 1988. More than 30 years later, a detective announced she had caught the killer - ...

In a shallow area near the water's edge, something happened that would forever change life on our planet: a fish from the class of lobe-finned fishes uses its pair of powerful pectoral fins to pull ...