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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.
A closed fracture.
Review in Changes in Eight Different Domains of Adult Functioning
Heart valves in closed position viewed from the top.
Review of Metric Prefixes
Gate control theory. A. open gate, B. closed gate
Acetylation and deacetylation in open and closed chromatin structure