Enumerated powers. The enumerated powers are a list of items found in Article I, Section 8 of the U.S. Constitution that set forth the authority of Congress. In summary, Congress may exercise the powers that the Constitution grants it, subject to the individual rights listed in the Bill of Rights.
The average adult has 10-12 pints of blood. Someone needs blood every two seconds in the U.S. 40,000 pints: Amount of donated blood used each day in the U.S. and Canada. Through a process of separating blood into its individual parts, a single unit of blood can help extend the lives of as many as three people.
Every three seconds someone needs blood. One out of every 10 people entering a hospital needs blood. Just one pint of donated blood can help save as many as three people's lives. The average adult has 10 pints of blood in his or her body. One unit of blood is roughly the equivalent of one pint. Blood makes up about 7% of your body's weight.