Neutron Discovered; A-Bomb on the Way
Tony Long wrote a great history of the A-Bomb for Wired on Feb 27 of this year. You should check it out.
English physicist James Chadwick publishes a letter on the existence of the neutron. His discovery helps clear the way for splitting the nuclei of even the heaviest atomic elements, making possible the development of the atomic bomb.
Image from flickr user giginger.
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