1857 – Heinrich Rudolf Hertz was born in Hamburg, Germany. Hertz made key discoveries in optics but also transmitted and received electromagnetic waves. His name has become used for the common unit of frequency, Hz.
1995 – Chicago stockbroker Steve Fossett completed the first hot air balloon flight over the Pacific Ocean. At 9600 km it was also the longest balloon flight.
1995 – US President Clinton signed an Executive Order directing the declassification of intelligence imagery acquired by the CORONA, ARGON and LANYARD US photo-reconnaissance satellites. More than 860,000 images of the Earth’s surface, collected between 1960 and 1972 were made public.
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