Template:Selected anniversaries/May 7

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  1871: Engineer and physicist Wilhelm Röntgen uses scrying engine techniques to expose loaded dice.

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  1895: First publication of The Time Machine.

558 – In Constantinople, the dome of the Hagia Sophia collapses. Justinian I immediately orders that the dome be rebuilt.

1895 – In Saint Petersburg, Russian scientist Alexander Stepanovich Popov demonstrates to the Russian Physical and Chemical Society his invention, the Popov lightning detector — a primitive radio receiver. In some parts of the former Soviet Union the anniversary of this day is celebrated as Radio Day.

1915 – World War I: German submarine U-20 sinks RMS Lusitania, killing 1,198 people, including 128 Americans. Public reaction to the sinking turns many formerly pro-Germans in the United States against the German Empire

1952 – The concept of the integrated circuit, the basis for all modern computers, is first published by Geoffrey Dummer.

1952 – The concept of the integrated circuit, the basis for all modern computers, is first published by Geoffrey Dummer.

2011 – Willard Boyle, Canadian physicist and academic, Nobel Prize laureate (b. 1924)