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Did you know?

The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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If you could remove all of your skin, it would weigh up to 5 pounds.

Structure of a typical animal cell Structure of a typical animal cell
A typical eukaryotic cell. A typical eukaryotic cell.
A typical waveform from a knock sensor during a spark knock event. This signal is sent to the ... A typical waveform from a knock sensor during a spark knock event. This signal is sent to the ...
A typical low-side driver (LSD) which uses a control module to control the ground side of the relay ... A typical low-side driver (LSD) which uses a control module to control the ground side of the relay ...
A typical peak-and-hold fuel-injector waveform. Most fuel injectors that measure less than 6 ohms ... A typical peak-and-hold fuel-injector waveform. Most fuel injectors that measure less than 6 ohms ...
Step 1 of upper eyelid eversion Step 1 of upper eyelid eversion
Video: T cell receptors

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