The American Revolution was the first wave of the Atlantic Revolutions: the French Revolution, the Haitian Revolution, and the Latin American wars of independence. Aftershocks reached Ireland in the Irish Rebellion of 1798, in the PolishâLithuanian Commonwealth, and in the Netherlands.
A reconstruction of Homo erectus, the earliest human species that is known to have controlled fire (reconstruction shown in WestfÃ¤lisches Landesmuseum, Herne, Germany, in a 2006 exhibition)
The gases nitrous oxide, ether, and chloroform were first used as anesthetics in the nineteenth century, ushering in the modern era of anesthesia. Nitrous oxide, or laughing gas, was discovered as an anesthetic by English chemist Humphry Davy (1791â1867) in 1799.