Penicillin was originally noticed by a French medical student, Ernest Duchesne, in 1896.
Until the 1950s, most people thought of sleep as a passive, dormant part of our daily lives, but we now know that our brains are very active during sleep.
The Battle of Stalingrad is considered by many historians to have been the turning point in World War Two in Europe.
It is believed that rice cultivation began simultaneously in many countries over 6500 years ago.
Bottom trawling is a practice where fishermen literally drag nets across an ocean floor, killing virtually everything in their pursuit of one type of fish.
Many predators search for their prey with their eyes.
Zhuangzi was a Taoist philosopher who had a perplexing experience.
______ (U) Soon though, he woke and realized that the butterfly was really Zhuangzi who dreamed he was a butterfly, or was it a butterfly who dreamed he was Zhuangzi!
A “potlatch” is a ceremony of North American Indians of the northwest coast from Washington to Alaska.