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Thyroid conditions may make getting pregnant impossible.
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.
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.
It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
![Pulse oximetry with the sensor probe applied securely, flush with skin, making sure that both sensor](https://biology-forums.com/gallery/47/medium_14755_01_10_12_7_52_54_91982233.jpeg)
![Thyroidectomy. In this procedure, the thyroid gland is accessed by a vertical incision through the n](https://biology-forums.com/gallery/47/medium_14755_14_10_12_6_36_53_93901554.jpeg)