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In 1864, the first barbiturate (barbituric acid) was synthesized.

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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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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

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Though methadone is often used to treat dependency on other opioids, the drug itself can be abused. Crushing or snorting methadone can achieve the opiate "rush" desired by addicts. Improper use such as these can lead to a dangerous dependency on methadone. This drug now accounts for nearly one-third of opioid-related deaths.

Normal and mutant homeotic gene action in Arabidopsis Normal and mutant homeotic gene action in Arabidopsis
Primary visual processing areas (blue) in (a) human (lateral and mesial views) and (b) chimpanzee. Primary visual processing areas (blue) in (a) human (lateral and mesial views) and (b) chimpanzee.
Heat Stress and Wind Chill: Indices of Human Discomfort Heat Stress and Wind Chill: Indices of Human Discomfort
Human-fish Sculpture Human-fish Sculpture
Normal change in sea level Normal change in sea level
Major blood vessels of the human cardiovascular system Major blood vessels of the human cardiovascular system
Video: Supine Position

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