Human evolution is often told as a tidy story of adaptation, yet some of our most familiar body parts still defy ...

An organ is a group of tissues that work together to perform a specific task in the body, such as digesting nutrients or producing chemical messengers that enable brain cells to communicate. Although ...

Wall St. Insights Many body parts can be transplanted or replaced with artificial equivalents, including corneas, livers, ...

Your kidneys are like filters. Your brain is like a computer. Your digestive system is like a tube. Your hands are controlled a bit like a marionette. These comparisons exist in part because doctors ...