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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.
In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
![Giardiasis. Colorized electron micrograph of a Giardia protozoan adhering to the surface of an epith](https://biology-forums.com/gallery/47/medium_14755_26_10_12_5_23_00_96851294.jpeg)
![Seven black members of Congress in 1871 are from left to right: Senator Hiram Revels (R-MS) and Repr](https://biology-forums.com/gallery/47/medium_376063_22_08_15_11_28_17_223661853.jpeg)