May 30, 1431
Joan of Arc (French: Jeanne d'Arc pronounced [ʒan dark]), the French heroine during the Hundred Years’ War, was convicted and burned to death.
Five hundred years after her death, she was canonized as a saint by the Roman Catholic Church. （圣女贞德）
Today is
Loomis Day
It is a day dedicated to the American dentist Mahlon Loomis, who is considered by some historians of technology as the first wireless telegrapher.
Wait, a dentist? Wireless telegrapher?
Yes.
The TV we watch, the radio we listen to, and the wi-fi we can’t live without today all come from his idea that there were charged layers in the earth's atmosphere.
In 1868, Mahlon Loomis demonstrated his “wireless communication system” with two kites spaced fourteen miles apart on two Virginia hilltops.
Thirty years later, Guglielmo Marconi, an Italian inventor, proved the feasibility of radio communication (Loomis’ hypothesis), and in 1899 he flashed the first wireless signal across the English Channel.
May 30, 1778
Voltaire 伏尔泰 (real name: François-Marie Arouet), the French writer, historian, and philosopher, died at age 83.