|
|
An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
There are more bacteria in your mouth than there are people in the world.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
![Elephant work camp in Thailand. Elephants are used for heavy forest work and in circus presentations](https://biology-forums.com/gallery/47/medium_27692_23_04_12_3_23_30.jpeg)
![Lilly Martin Spencer’s Young Husband: First Marketing (1854). Note that passers-by are amused at thi](https://biology-forums.com/gallery/47/medium_375348_18_08_15_9_36_28_222961281.jpeg)