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The familiar sounds of your heart are made by the heart's valves as they open and close.
About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.
Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
![Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag](https://biology-forums.com/gallery/47/medium_33_19_02_12_5_39_50_20561464.jpeg)
![Cushing’s syndrome. A photograph of a woman with the characteristic facial features of Cushing’s syn](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_43_57_82421002.jpeg)