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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

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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.

Diagrams showing the multiple energy shells and orbitals of a nitrogen atom Diagrams showing the multiple energy shells and orbitals of a nitrogen atom
Chromosome territories in the cell nucleus Chromosome territories in the cell nucleus
A molecular model showing chromosome territories in the cell nucleus of humans A molecular model showing chromosome territories in the cell nucleus of humans
The nucleus of Halley's Comet, taken by the Giotto probe in 1986 The nucleus of Halley's Comet, taken by the Giotto probe in 1986
Bohr Model of Hydrogen Atom Bohr Model of Hydrogen Atom
In 1969 a UC Berkeley group fired a carbon nucleus at a californium target. Give In 1969 a UC Berkeley group fired a carbon nucleus at a californium target. Give
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