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

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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.

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There are 20 feet of blood vessels in each square inch of human skin.

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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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.

A plant infected with tobacco mosaic virus A plant infected with tobacco mosaic virus
Color-enhanced scanning electron micrograph of HIV virus (red) infecting T-helper cells (green). Color-enhanced scanning electron micrograph of HIV virus (red) infecting T-helper cells (green).
flue virus flue virus
Structure of the human immunodeficiency virus (HIV). Structure of the human immunodeficiency virus (HIV).
A Herpesviridae virus, the herpes simplex virion. It has an icosahedral capsid with double-stranded ... A Herpesviridae virus, the herpes simplex virion. It has an icosahedral capsid with double-stranded ...
Viruses, such as the hepatitis B virus shown here, need a host to survive and multiply Viruses, such as the hepatitis B virus shown here, need a host to survive and multiply
Video: Control of ventilation rate by other brain centers (posts, hypothalamus & cerebral cortex)

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