Whiteboard
Albert Stallion invented whiteboards while working at Alliance in the 1960s. Alliance (now known as PolyVision) produced enameled steel for architectural cladding, but Stallion noted it could also potentially be used as a writing surface. Stallion later left Alliance to form his own whiteboard production company, MagiBoards.
History of Go
In 1954 a complete Go board made out of stone was found in a tomb dating to the Eastern Han dynasty (25–220) in Wangdu County, Hebei Province. This board has a 17 × 17 grid, which confirms the statement by the 3rd century author Handan Chun in the "Classic of Arts" that Go was at this time played on a 17 × 17 grid:
The go board has 17 lines along its length and breadth, making 289 points in all. The black and white stones each number 150.
The earliest board with a 19 × 19 grid to have been found is a ceramic board dating to the Sui dynasty (581-618) that was excavated from Anyang in Henan Province, so sometime between the 3rd and 6th centuries a change in grid size must have taken place. However, the 17 × 17 board has survived in the version of Go played in Tibet.