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On March 18, 1965, the first spacewalk took place as Soviet cosmonaut Alexei Leonov went outside his Voskhod 2 capsule, secured by a tether.

In 1984, the last U.S. Marines deployed to Beirut as part of an international peacekeeping force withdrew from the Lebanese capital.

PITTSBURGH — In the world of autonomous vehicles, Pittsburgh and Silicon Valley are bustling hubs of development and testing. But ask those involved in self-driving vehicles when we might actually see them carrying passengers in every city, and you'll get an almost universal answer: Not anytime soon.