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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
The longest a person has survived after a heart transplant is 24 years.
A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.

