Blog Post Top 101 Black Inventors & African American's Best Invention Ideas that Changed The World
and an active member of the National Council of Negro Women. 34. Percy Lavon Julian (1899 – 1975) – Aero-foam Percy Lavon Julian was a renowned chemist who made many significant inventions. One of his creations
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Blog Post Top 100 Famous Inventions and Greatest Ideas of All Time
Gregorian calendar is the most widely used civil calendar today. It was intended as a revision to the Julian calendar. It jumped ahead 10 days in an effort to synchronize world time with the four seasons. 21