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The largest baby ever born weighed more than 23 pounds but died just 11 hours after his birth in 1879. The largest surviving baby was born in October 2009 in Sumatra, Indonesia, and weighed an astounding 19.2 pounds at birth.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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

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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

The Meselson and Stahl experiment showing that DNA replication is semiconservative The Meselson and Stahl experiment showing that DNA replication is semiconservative
Testing the reducing atmosphere hypothesis for the origin of life - the Miller and Urey experiment. Testing the reducing atmosphere hypothesis for the origin of life - the Miller and Urey experiment.
The Movius line separates regions of the world where Acheulean hand axes were made from regions wher The Movius line separates regions of the world where Acheulean hand axes were made from regions wher
Functional MRI Scans These scans of human brains show localized average increases in neural activity Functional MRI Scans These scans of human brains show localized average increases in neural activity
Pavlov’s Salivary Conditioning Experiment (1 of 2) Pavlov’s Salivary Conditioning Experiment (1 of 2)
Risk & Aseptic Processing - RABs Filling Line Risk & Aseptic Processing - RABs Filling Line
Video: Cell mediated immune response to a viral infection Animation

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