|
|
Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
Thyroid conditions may make getting pregnant impossible.
Did you know?
In 1864, the first barbiturate (barbituric acid) was synthesized.
Did you know?
The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
Did you know?
In 1844, Charles Goodyear obtained the first patent for a rubber condom.