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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.
Methicillin-resistant Staphylococcus aureus or MRSA was discovered in 1961 in the United Kingdom. It if often referred to as a superbug. MRSA infections cause more deaths in the United States every year than AIDS.
In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
![Cranial capacity has increased approximately fourfold over the last 3.5 million years of hominin evo](https://biology-forums.com/gallery/47/medium_273688_23_02_15_7_07_16_2083771.jpeg)
![In early industrialization, children worked alongside adults. They worked 12 hours a day Monday to ...](https://biology-forums.com/gallery/27/medium_660366_13_04_17_6_20_49_27692552.png)