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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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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

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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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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

The ozone hole in September, 2003. Even as scientists verified that the rate of ozone depletion was The ozone hole in September, 2003. Even as scientists verified that the rate of ozone depletion was
The otoscope is positioned in the ear prior to examination of the auditory canal. The otoscope is positioned in the ear prior to examination of the auditory canal.
The Sleep/Waking Flip-Flop According to Saper et al. (2001), the major sleep-promoting region (the v The Sleep/Waking Flip-Flop According to Saper et al. (2001), the major sleep-promoting region (the v
Medicinal leeches on a patient’s neck. Today leeches are sometimes used in microsurgery to prevent b Medicinal leeches on a patient’s neck. Today leeches are sometimes used in microsurgery to prevent b
The Yorktown Campaign, April to September 1781 The Yorktown Campaign, April to September 1781
Identical twins (monozygotic twins) have the same sex and share a single genotype. Identical twins (monozygotic twins) have the same sex and share a single genotype.
Video: Gastrulation: cross section of the frog

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