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American engineer and inventor Douglas Engelbart dies

He invented the computer mouse, hypertext, networked computers, and precursors to graphical user interfaces. He demonstrated all these inventions in 1968 in a famous presentation. Engelbart also observed that the intrinsic rate of human performance is exponential. This observation is called Engelbart's Law.

Giotto probe is launched

Built and operated by ESA, Giotto was a probe made for flyby of the Halley comet. Indeed, on 13th March 1986 she approached the comet nucleus on just 596 kilometers. Giotto measured chemical composition of the material ejected from the comet and took pictures. Later, in 1990, she studied another comet, Grigg-Skjellerup.

Zeppelin airship flies for the first time

The airship was called LZ 1. Ferdinand von Zeppelin flew her from a floating hangar on Lake Constance in southern Germany. Zeppelins were used for passenger transportation or as early bombers on the beginning of the twentieth century. Later, they were surpassed by aircraft. Today, the are used mostly as experimental vessels.

British physicist William Bragg is born

Bragg is most known for his invention of a method how to determine crystal structure of using X-rays. He developed it with his son Lawrence Bragg. They won a Nobel prize for it, the only father and son pair to this day. The mineral Braggite is named after them. During the WW1 Bragg worked on the development off sonar.

Anniversaries of famous