There are 118 elements on the period i c table, and you might think we are made up of many of them. But that's not the case; the complex systems that make up our bodies have a surprisingly simple ...

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 ...

Fear begins deep in the brain. The amygdala, buried within the temporal lobe, acts as an alarm system, detecting threats and ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Each human is a ...

From periods of rapid aging in our 40s and 60s to ancient brains that don’t decompose, here are some of the year’s most intriguing stories about human biology It can sometimes feel like health ...

Few places on Earth — or in our bodies — seem to be free of microplastics. Researchers in recent months have announced the discovery of microplastics traveling in the bloodstream of a handful of ...