Compositions   1916: Cello Concerto 1920: Choros No 1 for Guitar 1929: Twelve Studies for Guitar 1930: Bachianas Brasileiras Nos 1 & 2 1939: New York Skyline 1945: Bachianas Brasileiras Nos 5 & 9	Science 1905: Einstein: Theory of Relativity   1919: Rutherford: Splits the Atom   1930: Carrother/Du Pont: Nylon     1953: Crick & Watson: Helical DNA