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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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.
The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.