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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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Cyanide works by making the human body unable to use oxygen.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
tree-ring data
Elements of an Experiment
Molecular tree of life
ELEMENTS OF ARCHITECTURE: The Roman Arch "القوس الروماني"
A phylogenetic tree showing that all non-African human populations share a closer genetic relationsh