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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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The average office desk has 400 times more bacteria on it than a toilet.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

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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.

Operant conditioning, also known as trial-and-error learning. Operant conditioning, also known as trial-and-error learning.
Rodents Show Empathy-Driven Behavior Rodents Show Empathy-Driven Behavior
Biology deals with the study of the many varieties of living organisms. Biology deals with the study of the many varieties of living organisms.
The world attempted to deal with Somalia as if it were a real country but painfully learned that Som The world attempted to deal with Somalia as if it were a real country but painfully learned that Som
Frederick Douglass, having escaped from slavery in 1836, attracted large audiences as an antislavery Frederick Douglass, having escaped from slavery in 1836, attracted large audiences as an antislavery
Studying the genetic roots of mating and bonding behavior Studying the genetic roots of mating and bonding behavior
Video: Griffith's experiments

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