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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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.
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.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
![Traniello and his colleagues demonstrated that social insects may develop “social imm](https://biology-forums.com/gallery/47/medium_33_01_08_11_10_47_28_1303845.jpeg)
![Fibroid tumors, or leiomyomas. Fibroids develop from the uterus to form a variety of hard, round ben](https://biology-forums.com/gallery/47/medium_14755_26_10_12_5_31_31_9713214.jpeg)