|
|
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 first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
![The experimental approach used by Masui and Markert to identify cyclin and cyclin-dependent kinase (](https://biology-forums.com/gallery/47/medium_33_25_06_11_10_10_31.jpeg)
![Inspect the site for potential veins to use and palpate to further locate a vein and test the firmne](https://biology-forums.com/gallery/47/medium_18099_26_09_12_4_32_34.jpeg)
![That politics was always a rough business is shown in this cartoon, which shows Lincoln, assisted by](https://biology-forums.com/gallery/47/medium_375552_19_08_15_9_26_03_22340753.jpeg)