4/30/45: "Urchin" design chosen for implosion bomb initiator. Spy George Koval sent info on it to USSR: http://ow.ly/4neRMw @wellerstein
Replying to @AtomicHeritage
@AtomicHeritage On the urchin's design: http://blog.nuclearsecrecy.com/2015/05/11/bohr-at-los-alamos/ …
8:05 AM - 30 Apr 2016
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