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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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

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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

The fate of carbon in the citric acid cycle The fate of carbon in the citric acid cycle
Hydration of a Carbon–Carbon Double Bond Hydration of a Carbon–Carbon Double Bond
Atmospheric carbon dioxide concentrations in ppm Atmospheric carbon dioxide concentrations in ppm
Stable isotopes of carbon Stable isotopes of carbon
Carbon is constantly exchanged between large reservoirs in the lithosphere Carbon is constantly exchanged between large reservoirs in the lithosphere
Abbreviated pathway describing the biosynthesis of arginine in Neurospora Abbreviated pathway describing the biosynthesis of arginine in Neurospora
Video: Flexor reflex & Crossed extensor reflex

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