|
|
Did you know?
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
Did you know?
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Did you know?
More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
Did you know?
Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.
Did you know?
Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
![Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones](https://biology-forums.com/gallery/47/medium_12359_26_01_13_3_56_27.jpeg)
![Upward social mobility, though welcome, can place people in a world so different from their world of ...](https://biology-forums.com/gallery/27/medium_660366_13_04_17_9_02_38_27738534.png)