[['Plutonium', 'NOTES', 'Prepared by bombardment of uranium with deuterons.'], ['Plutonium', 'OBSERVER', 'Glenn T. Seaborg, Arthur C. Wahl, W. Kennedy and E.M. McMillan']]
Glenn T. Seaborg, Arthur C. Wahl, W. Kennedy and E.M. McMillan bombarded uranium with deuterons, and a new element, Plutonium was discovered.