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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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.
Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.