One of the major ways we get sick is we touch surfaces out in the world, many made of metal or plastic.
Scientists said they have found evidence of a giant planet far out in our solar system.
British scientists say they have found the oldest known evidence of war.
Scientists are developing a medical device that could tell them more about the human body, and help them develop more-effective treatments for cancer, heart disease and brain disorders.
Apple says it will fight the U.S. government about sharing information from the iPhone used by a shooter in a deadly attack in California.
The White House is officially on Snapchat.
Researchers at Virginia Tech University have been studying how dogs drink.
A huge percentage of bird species are in danger because their habitats, or homelands, are disappearing.
Three university students in Santiago, Chile have developed a plant-powered device to charge their mobile phones.
NASA scientists discovered water flows on the surface of Mars.