This episode explores a wide range of historical happenings on December 1st, spanning from 800 AD when Charlemagne convened a council to address accusations against Pope Leo III to the collapse of the Arecibo Telescope in 2020. The show will examine key events like the inauguration of Vicente Fox as the first opposition party president of Mexico in 2000, the proclamation of World AIDS Day in 1988, and the birth of the first underground railway in Latin America in 1913. The episode will also remember significant figures born and passed away on this date, including notable individuals like actress Zoe Kravitz, baseball player Gaylord Perry, and the first female U.S. Supreme Court Justice, Sandra Day O'Connor.