A research group has discovered that a natural substance in the body, known as platelet-activating factor (PAF), can strongly ...

Discover the order of planets in the solar system. From Mercury to Neptune, explore our solar system and learn more about our cosmic home. The solar system is our cosmic neighborhood, made up of ...

Smoking can harm your digestive system in a number of ways. Smokers tend to get heartburn and peptic ulcers more often than nonsmokers. Smoking makes those conditions harder to treat. Smoking ...