All species on Earth, both living and extinct, are related. We know this because of a biological tool called the tree of life. This "tree" takes the form of a diagram that maps the relationships ...

Calling something the “tree of life” may conjure up a lush arboreal species with mouth-watering fruit. Yet on the African continent, this moniker is reserved for the baobab tree. Upon first glance, ...

Why do you have five fingers? Why not ten, or twenty, or one? Why do so many animals have five fingers? Five seems to be the perfect number for most hands. Oddly, the first vertebrates to come onto ...