Epinephrine is a hormone secreted by the adrenal medulla and released into the bloodstream in response to physical or mental stress, as from fear or injury. It triggers a number of bodily responses, including increased blood pressure, heart rate, metabolic rate, and respiratory rate. It also raises glucose levels in the blood for use as fuel when more alertness or greater physical effort is needed. These reactions are known as the fight-or-flight response. Epinephrine is popularly known as what?
George Bernard Shaw
Back in the day
Emperor Gaozu was the founder of the greatest of China's imperial dynasties, the Tang dynasty (618-907 CE), which ruled over what was then the world's largest empire and initiated a golden age for art, science, and Buddhism. Before becoming emperor, Li Yuan, as he was then known, was governor of a province under the Sui Dynasty. When the Sui emperor, Yangdi, was assassinated in 618, Li Yuan reunited the empire and took power. Why did he later abdicate the throne in favor of his son, Li Shimin?
Born on a day like today
Mallory was an English mountain climber who participated in the Everest expeditions of 1921, 1922, and 1924. The 1924 expedition culminated in a bold and possibly successful drive toward the summit by Mallory and Andrew Irvine, from which they did not return. Mallory's body was discovered on Everest in 1999. His achievements and the mystery surrounding his final effort have made him a mountaineering legend. What "three most famous words in mountaineering" are attributed to Mallory?