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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.
Thyroid conditions may make getting pregnant impossible.
Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.