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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

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A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Comet Tempel 1 67 seconds after colliding with the Deep Impact probe. Comet Tempel 1 67 seconds after colliding with the Deep Impact probe.
Participation of water in biological reactions Participation of water in biological reactions
This 1900 photograph of steel factories at night in Duquesne, near Pittsburgh, was tinted by hand. S This 1900 photograph of steel factories at night in Duquesne, near Pittsburgh, was tinted by hand. S
Water-Soluble Vitamins Act as Coenzymes in Metabolic Processes Water-Soluble Vitamins Act as Coenzymes in Metabolic Processes
Water CO2 Water CO2
Air-Mass Source Regions for North America Air-Mass Source Regions for North America
Video: Fertilization and Development

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