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The familiar sounds of your heart are made by the heart's valves as they open and close.
Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.