Dry indoor air is a common problem that can exacerbate respiratory symptoms, cause dry skin and hair, and even make snoring worse. In this article, learn how using a humidifier can help to alleviate these and other problems. We also describe the possible risks and how to use a humidifier safely.

Head injuries range from mild to severe. Some are treatable at home with ice and rest, while others are life-threatening and require immediate medical treatment. In this article, learn about the types of head injuries, common symptoms, how to recognize a concussion, and when to see a doctor.

Caffeine is known to protect against heart disease and stroke. A new study finds the mechanism that underpins this protection, and mitochondria are key.