Boris Chertok, Russian Rocket Engineer, Dies at 99

[unable to retrieve full-text content]Mr. Chertok was a rocket engineer who played a central role in designing the navigation systems for Soviet spacecraft during the race to the moon, among them the one that carried the first human into space.

Source: http://feeds.nytimes.com/click.phdo?i=48e3efb10123a457b291d826c7cad76d

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