|
|
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
![Anatomically modern humans from the Israeli cave sites of Skhul and Qafzeh may be the earliest found](https://biology-forums.com/gallery/47/medium_273688_23_02_15_7_03_10_2082494.jpeg)
![American soldiers—some of them regulars in deep blue uniforms, others in buckskin cowboy outfits— fi](https://biology-forums.com/gallery/47/medium_375552_19_08_15_9_09_50_223155.jpeg)