This scanning electron micrograph shows specially engineered nanoparticles that are used to deliver drugs into tissues. If designed with a special surface coating, such drug carriers can home in on particular cells to help stop bleeding and heal injuries.
This 14,700-year-old human leg bone was found in a British cave. Human tooth marks and pounding damage (in boxed area) suggest that the person’s body had been cannibalized as part of a ritual.
Some of the central pyramids of ancient Caracol in Belize. Laser mapping showed that at its peak, this Mayan metropolis sprawled over an area the size of present-day Washington, D.C.
Stress and anxiety can lead to serious mental and behavioral problems. Identifying stressors can help people cope with anxiety. Even better, viewing stress as a strength can tone down anxious feelings and boost productivity.
Certain types of fiber suppress appetite, at least in mice. Found in fruits, vegetables, oats and barley, this fiber breaks down in the gut to release acetate. That travels to the brain, where the chemical prompts the release of hunger-fighting hormones.