Harmful strains of E. coli, a bacterium in the gut of many mammals, can make people very sick. But some types of E. coli are actually helpful. They prevent bad bacteria from invading your intestines and also help produce vitamin K2, which is good for bones and arteries. (Photo: Rocky Mountain Laboratories)
Kids Discover For over 25 years, we’ve been creating beautifully crafted nonfiction products for kids. With a specialty in science and social studies, our team of talented writers, award-winning designers and illustrators, and subject-experts from leading institutions is committed to a single mission: to get children excited about reading and learning.