Template:Selected anniversaries/March 30
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1599: Mathematician Adam Ries dies. He wrote textbooks for practical mathematics, promoting the advantages of Arabic/Indian numerals over Roman numerals.
1939: Hellscreiber teleprinter system used to publish new biography of Omar Khayyam.
1942: Der Reichsspritzenmeister develops new memory-wiping drug for Abomynous.
2009: Egg Tooth Neighborhood Association sponsors new episode of Dennis Paulson of Mars.