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Jan
13
13th January in history

1610 - Galileo Galilei discovers Callisto, 4th satellite of Jupiter
1888 - National Geographic Society founded (Washington, DC)
1906 - 1st radio set advertised (Telimco for $7.50 in Scientific American) claimed to receive signals up to one mile
1964 - Hindu-Muslim rioting breaks out in the Indian city of Calcutta - now Kolkata - resulting in the deaths of more than 100 people.

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