|
|
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
![The relative influence of heredity and the environment in human behavior has fascinated and plagued ...](https://biology-forums.com/gallery/47/medium_660365_19_12_16_11_52_41_243301226.png)
![Family interactions change in response to the developing child, and parenting characteristics, such ...](https://biology-forums.com/gallery/47/medium_667187_21_02_17_7_47_29_256752231.png)