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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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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.

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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.

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Approximately 25% of all reported medication errors result from some kind of name confusion.

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In inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.

Extinction and immigration of bird species on the California Channel Islands between 1917 and 1968 ( Extinction and immigration of bird species on the California Channel Islands between 1917 and 1968 (
Several species of squirrels have melanistic phases. In large parts of United States and Canada, the Several species of squirrels have melanistic phases. In large parts of United States and Canada, the
Marine Life Zones "الحياة في أعماق البحار" Marine Life Zones "الحياة في أعماق البحار"
Sensory Differences Between Species Sensory Differences Between Species
Deep Pelagic Zone: Giant siphonophore Deep Pelagic Zone: Giant siphonophore
Three queens, fertile females in species that have a reproductive division of labor. Three queens, fertile females in species that have a reproductive division of labor.
Video: Cardiac Cycle (Part 3 of 4)

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