We explain why snakes have to shed their entire top layer of skin in one go as part of their growth cycle and how often they ...

When you’ve got a tough exterior, there’s only one way to grow: Shed your skin. Arthropods, the most abundant group of animals on Earth, all possess a hard outer covering called an exoskeleton, which ...

At least she has long been portrayed as one. There was Benjamin Franklin’s 1754 political cartoon, “JOIN, or DIE.” Then came General Gadsden’s “Don’t Tread on Me” flag during the Revolution. The ...