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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

A human pedigree containing inbreeding. A human pedigree containing inbreeding.
Approach used to determine the evolutionary relationships among many animal species using molecular Approach used to determine the evolutionary relationships among many animal species using molecular
Deformation in human bones caused by (a) rickets and (b) osteoporosis. Deformation in human bones caused by (a) rickets and (b) osteoporosis.
Relationship between fruit radius and beak length in populations of native and introduced species of Relationship between fruit radius and beak length in populations of native and introduced species of
The greatest bone mass is found around age 30 for both men and women, with the later decline being f The greatest bone mass is found around age 30 for both men and women, with the later decline being f
Some threatened and endangered species Some threatened and endangered species
Video: Bond types - Atomic structure and basis of bonds

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