Blood – everyone's got it. In fact, an adult who weighs between 150 and 180 pounds has around 1.2 to 1.5 gallons of blood in their body. This makes up approximately 10% of an adult’s weight. Blood ...

In an emergency, knowing your blood type could save your life. While this may sound dramatic, it’s true, especially if you have a rare blood type such as AB-negative. If you’ve never given blood or ...