Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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 highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
Model of a longitudinal study in which 983 students were surveyed in 1984 and then again in 1985, 19
Cultural Variations in the Strange Situation Across cultures, most toddlers exhibit secure attachme
Improperly worded questions can steer respondents toward answers that are not their own, which ...
Sperry’s classic study of eye rotation and regeneration.