After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
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The horizontal fraction bar was introduced by the Arabs.
Simple amplification of 1kb DNA fragments by polymerase chain reaction.
A Platypus swimming in Broken River, Eungella National Park, Queensland, Australia.