Template:Selected anniversaries/May 7
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1871: Engineer and physicist Wilhelm Röntgen uses scrying engine techniques to expose loaded dice.
1895: Russian physicist Alexander Stepanovich Popov demonstrates to the Russian Physical and Chemical Society his invention, the Popov lightning detector — a primitive radio receiver.
1895: Judge Havelock purchases signed first edition of The Time Machine as a gift for Russian physicist Alexander Stepanovich Popov.
1895: First publication of The Time Machine.