For the first time in the history of the nuclear age, the USA and Russia signed an agreement in this year to limit the production of nuclear weapons, making the world a safer place.
One of the saddest events of the space race happened in this year when Gus Grissom, Ed White, and Roger Chaffee are killed when a fire ignited in their Apollo 1 capsule while performing a test on the launch pad.
The year after:
NASA was so upset by the Apollo 1 fire that they skipped several Apollo missions and didn't start again until Apollo 7.
The year before: