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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?
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
Did you know?
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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?
Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.
![Examples of four different types of cells from the body. Although each cell has a cell membrane, nuc](https://biology-forums.com/gallery/47/medium_14755_16_09_12_5_52_12_8537838.jpeg)
![Human immunodeficiency virus gains entry into helper T cells, uses the cell DNA to replicate, interf](https://biology-forums.com/gallery/47/medium_14755_01_10_12_7_59_22_9233407.jpeg)