After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
Structure of the enzyme chymotrypsin, a globular protein
Structure of chymotrypsin
Catalysis of peptide bond hydrolysis by chymotrypsin (part 1)
Catalysis of peptide bond hydrolysis by chymotrypsin (part 2)
The structure of chymotrypsin and the serine protease catalytic triad