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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.