Guidonian hand
In Medieval music, the Guidonian hand was a mnemonic device used to assist singers in learning to sight-sing. Some form of the device may have been used by Guido of Arezzo, a medieval music theorist who wrote a number of treatises, including one instructing singers in sightreading. The hand occurs in some manuscripts before Guido's time as a tool to find the semitone; it does not have the depicted form until the 12th century. Sigebertus Gemblacensis in 1105–10 did describe Guido using the joints of the hand to aid in teaching his hexachord. The Guidonian hand is closely linked with Guido's new ideas about how to learn music, including the use of hexachords, and the first known Western use of solfege.
Athletics at the 1912 Summer Olympics – Men's two handed discus throw
The men's two handed discus throw was a track and field athletics event held as part of the Athletics at the 1912 Summer Olympics programme. It was the only appearance of the event at the Olympics, along with the other two handed throws. The format of the event was such that each thrower threw the discus three times with his right hand and three times with his left hand. The best distance with each hand was summed to give a total. The three finalists received three more throws with each hand. The competition was held on Saturday, July 13, 1912. Twenty discus throwers from six nations competed.