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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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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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A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.

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Electron micrograph of phage T4 Electron micrograph of phage T4
Free energy change during electron transport Free energy change during electron transport
Scorpions, Spiders and Sharks: Electron-Microscope Images Scorpions, Spiders and Sharks: Electron-Microscope Images
Transport of ammonia to the liver for urea synthesis Transport of ammonia to the liver for urea synthesis
A color-enhanced electron micrograph of circular plasmid molecules A color-enhanced electron micrograph of circular plasmid molecules
Video: Double Stranded DNA Molecule Animation

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