The UK returned Hong Kong’s control back to China after 156 years of British rule.
Source
The Morse code distress signal 'SOS,' originating from Germany, became the world's official message for help.
Sony's iconic Walkman first went on sale in Japan.
The first US postage stamps were issued.
The Cassini–Huygens spacecraft became the first to enter Saturn's orbit.
Tesla Motors was incorporated in Palo Alto, California, US.
