Learn why hand-sanitizer gels lose effectiveness over time, plus tips to keep hand sanitizer at full germ-killing strength for as long as possible.

Stress has a huge impact on the way our skin ages. Stress hormones speed up the ageing process, causing more fine lines and wrinkles.

Medically reviewed by Alicen Nelson MD, MPH The navel, also known as the belly button or umbilicus, is a small, round, or ...