|
|
Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
Signs and symptoms that may signify an eye tumor include general blurred vision, bulging eye(s), double vision, a sensation of a foreign body in the eye(s), iris defects, limited ability to move the eyelid(s), limited ability to move the eye(s), pain or discomfort in or around the eyes or eyelids, red or pink eyes, white or cloud spots on the eye(s), colored spots on the eyelid(s), swelling around the eyes, swollen eyelid(s), and general vision loss.
![Like most world-changing inventions, the printing press of fifteenth-century Europe took advantage o](https://biology-forums.com/gallery/47/medium_6_15_08_15_11_36_37_22214776.jpeg)
![The first commercially successful typewriter, manufactured in quantity beginning in 1874, surely fue](https://biology-forums.com/gallery/47/medium_376716_26_08_15_11_14_05_224411209.jpeg)