|
|
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
![These species are all at risk of extinction. Species with “slow†life-h](https://biology-forums.com/gallery/47/medium_33_22_09_11_9_27_14_1782478.jpeg)
![Classification of life histories based on juvenile survival, fecundity, and age at reproductive matu](https://biology-forums.com/gallery/47/medium_33_22_09_11_9_27_14_1790554.jpeg)
![Life-history cube, a classification of fish, mammals, and altricial birds based on three dimensionle](https://biology-forums.com/gallery/47/medium_33_22_09_11_9_40_13_182182.jpeg)