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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
The horizontal fraction bar was introduced by the Arabs.
When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
![Allen Test: A patent ulnar artery reveals the return of palm perfusion despite radial artery compres](https://biology-forums.com/gallery/47/medium_2137_21_07_12_6_35_44.jpeg)
![Allen Test: An occluded ulnar artery results in continued pallor of the hand while the radial artery](https://biology-forums.com/gallery/47/medium_2137_21_07_12_6_36_15.jpeg)