1883 – Thomas Edison and Stephen D. Field built the world’s first elevated electric railway. It was a narrow-gauge 3-foot-wide track in the gallery around the edge of the main exhibition building of the Chicago Railway Exhibition. It ran nine miles per hour.
2003 – The European Space Agency launched the Mars Express probe from the Baikonur space center in Kazakhstan. It was the fastest planetary probe to be built.
2014 – Apple announced OS X Yosemite and iOS8 at its Worldwide Developers Conference in San Francisco. Among the features were the ability to answer phone calls on your OS X computer, the ability for iOS apps to talk directly to each other, third=party keyboards for iOS, and a new programming language called Swift.
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