…which came first?
A. The first computer “Colossus,” invented by the British to break German encryption.
B. Penicillin, produced in mass quantities.
C. The first modern scuba system, the Aqualung, invented by Jacque Cousteau.
D. The year that the Thomas Jefferson Memorial was completed.
E. The year that the Pentagon was completed.
F. The year that the Great Depression formally ended.