|
|
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.
Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.
The average adult has about 21 square feet of skin.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
![This engraving by William Russell Birch shows Congress Hall (left), which was occupied by Congress f](https://biology-forums.com/gallery/47/medium_374628_16_08_15_9_52_06_222501221.jpeg)
![A family of African Americans arrive in Chicago, migrants from the American South, in an exodus that](https://biology-forums.com/gallery/47/medium_568533_22_08_16_12_18_10_23721218.jpeg)
![In 1948 the strongly Republican Chicago Daily Tribune printed its postelection headlines before all ...](https://biology-forums.com/gallery/47/medium_632960_01_12_16_11_27_10_24181281.jpeg)