Technically speaking, the human body is a donut, and the alimentary canal—leading from our mouths all the way down to our anuses —is the hole in the center. Microplastics found in the ...

Learn all about the human body's many systems and some ... uncovered possible functions for the long-maligned body part. Rachael is a Live Science contributor, and was a former channel editor ...

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 ...