Contra uma possível ameaça, o cérebro dispara reações para enfrentá-la ou fugir dela
"The most daring and controversial scientific experiment of the eighteenth century: inoculation against smallpox... Despite strong opposition, he urged inoculation... during an epidemic in the 1720s. The results confirmed the effectiveness... Inoculation had become a common medical procedure in America." (The Unifinished Nation) Picture from Wikipedia
Cuitláhuac, 10th tlatoani of the Aztec Empire, brother of Moctezuma II. After being held captive by the Aztecs, Cortés ordered Moctezuma to ask his people stop fighting. Moctezuma told him that they wouldn't listen to him, and in turn asked him to free his brother Cuitláhuac so he'd convince the people to stop. Once freed, Cuitláhuac led his people against the conquistadors and successfully drove them out of Tenochtitlán on June 30, 1520. After ruling for only 80 days, he died of smallpox.
Acoma Pueblo Indians, oldest continuously inhabited village in US The Acoma Pueblo, also known as "Sky City", is a Native American pueblo built on top of a 367-foot (112 m) sandstone mesa in the U.S. state of New Mexico. The Pueblo, believed to have been established prior to the 10th century, was chosen in part because of its defensive position against raiders. It is regarded as the oldest continuously inhabited community in the United States.