Learn more about the human tailbone and how, even though we may not have a strict need for it anymore, it still helps us with ...

Keratin is the tough protein that forms hair, nails and hooves. It’s also responsible for something far stranger: human horns ...

Scientifically speaking, the term "tail" usually refers to a flexible extension of the backbone, so it’s inherently a vertebrate feature, containing bones and often linked to the spine.