A patent was granted to Robert Goddard for a liquid-filled rocket.
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NASA's New Horizons space probe completed the first flyby of Pluto in the history of human spaceflight.
Dr. Benjamin Spock's book 'Common Sense Book of Baby & Child Care' was published.
Harper Lee's second novel, 'Go Set a Watchman,' was published.
Alpinists reached the summit of Matterhorn for the first time.
Ferrari secured its first Grand Prix victory at the 1951 British Grand Prix.
