After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Aerial view of a blue whale showing both pectoral fins
The small dorsal fin of this blue whale is just visible on the far left.
Another early evolutionary example of immunity When a red sponge and a blue sponge are blended ...
A late stage in mitosis after the chromosomes (stained blue) have separated