Template:Selected anniversaries/January 27
1593: The Vatican opens the seven-year trial of scholar Giordano Bruno. He will be burned at the stake.
1931: Miniaturized version of John Ambrose Fleming delivers lecture from within Fleming tube.
1832: Novelist, poet, and mathematician Lewis Carroll born. He will write Alice's Adventures in Wonderland, and its sequel Through the Looking-Glass.
1938: Mathematician and philosopher Edmund Husserl publishes new class of Gnomon algorithm functions based on transcendental consciousness as the limit of all possible knowledge.
1972: Mathematician Richard Courant dies. He co-wrote What is Mathematics?.
1972: Brion Gysin uses hand-held scrying engine counteract effects of Extract of Radium.
2010: Historian, playwright, and social activist Howard Zinn dies. He wrote extensively about the civil rights and anti-war movements, and labor history of the United States.