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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.
Blood is approximately twice as thick as water because of the cells and other components found in it.
More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.