We shall never know an exact date. It has been proven that cannabis has been used since prehistoric times.
Sometime in the 1930's.
It was discovered in 1898.
Saturn was discovered on March 25, 1610 by Galileo Galilei.
1922 was the date that vegemite was discovered
He was discovered in 1891
The primary active agent identified to date is 9-tetrahydro-cannabinol, known as THC.
Oxygen was discovered by Joseph Priestley in 1774. The exact date is August 1, 1774.
Protactinium was discovered in 1913 by Fajans and Gohring in Karlsruhe, Germany.
Antimatter was discovered in 1928 by Paul Dirac.
2013
1609
1325