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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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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.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

Animals of Hindustan monkeys called bandar that can be taught to do tricks Animals of Hindustan monkeys called bandar that can be taught to do tricks
Bay (left) and chestnut (sometimes called "sorrel") are two of the most common coat colors Bay (left) and chestnut (sometimes called "sorrel") are two of the most common coat colors
Lampreys (sometimes also called lamprey eels) are a family of jawless fish Lampreys (sometimes also called lamprey eels) are a family of jawless fish
Cerebral angiography. The four angiograms each reveal the distribution of blood vessels supplying th Cerebral angiography. The four angiograms each reveal the distribution of blood vessels supplying th
A square matrix P is called a permutation matrix if each row and column of P contains exactly ... A square matrix P is called a permutation matrix if each row and column of P contains exactly ...
A Gaucher cell showing accumulated fat stored in structures called lysosomes A Gaucher cell showing accumulated fat stored in structures called lysosomes
Video: Major Elements in Biological Molecules: Lipids

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