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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.
Blood is approximately twice as thick as water because of the cells and other components found in it.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.