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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.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.
There are approximately 3 million unintended pregnancies in the United States each year.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.