In 1902 – Joe Horn and Frank Hardart opened the first US Automat at 818 Chestnut St. in Philadelphia. The waiterless restaurant charged a nickel for most dishes.
In 1931 – Robert Goddard received a patent for rocket-fueled aircraft design (U.S. No. 1,809,271). Sadly we do not have a lot of rocket-planes in operation.
In 1986 – The Pittsburgh Supercomputer Center opened to support the National Science Foundation’s NSFNET, which linked five supercomputer centers. NSFNET would eventually allow commercial uses and transition to the open Internet.