Researchers at Northwestern University studied two things that most people use everyday—their toothbrush and showerhead—to see what was living in each. What they found was “quite surprising ...
Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. The warm, damp ...
Every electric toothbrush will clean your teeth, but some come with extra features and accessories that can bump up the price. Find out about the best electric toothbrush features and whether they're ...