|
|
The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.
Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
The human body produces and destroys 15 million blood cells every second.
There are more nerve cells in one human brain than there are stars in the Milky Way.
![Patients should be encouraged to bring to their health care visit all the substances that they take,](https://biology-forums.com/gallery/47/medium_2137_17_05_12_2_10_44.jpeg)
![Psychoactive substances: (left) Psilocybin is obtained from a species of mushroom; (right) LSD is ...](https://biology-forums.com/gallery/28/medium_482573_28_04_17_1_01_58_285241955.jpeg)