The Congregation of the Index, meeting in Rome, ruled that the idea of a sun-centered universe contradicted scripture and could not be held or defended. The decision, arriving just before Galileo Galilei's own confrontation with the Inquisition, made clear that the Church viewed Copernican astronomy as a threat to doctrine rather than a legitimate scientific question.

The treaty redrew the map of North America and beyond: France ceded Canada and territory east of the Mississippi to Britain, while Spain received Louisiana as compensation for losing Florida. The settlement made Britain the dominant colonial power but also saddled it with debts that would soon provoke tax disputes with its American colonies.

Following the initial signing on February 6, 1840, at Waitangi, colonial officials led by William Hobson traveled the North Island through February to secure additional Māori chiefly signatures. The treaty promised Māori land rights and citizenship in exchange for British sovereignty, though differing English and Māori translations sowed disputes that persist in New Zealand politics today.

Aldrin, a fighter pilot and MIT-trained astronautics doctor, joined NASA's astronaut corps in 1963 and pioneered orbital rendezvous techniques used throughout the Gemini and Apollo programs. On July 20, 1969, he followed Neil Armstrong onto the lunar surface, becoming the second man to walk on the Moon.

Negotiated during Mao's two-month visit to Moscow, the treaty pledged mutual defense against Japan or its allies and provided Soviet loans and technical assistance to rebuild China's shattered economy. The alliance shaped early Cold War geopolitics in Asia, though ideological rifts would fracture the partnership within a decade.

The attack came amid escalating tensions between Malcolm X and the Nation of Islam, which he had publicly broken from a year earlier. No one was killed, but the firebombing underscored the mounting threats against him in the final days before he was shot dead at the Audubon Ballroom on February 21, 1965.

Meeting in Moscow, Gorbachev signaled that the Soviet Union would not block the reunification of East and West Germany, provided the process respected the security interests of neighboring states. The announcement accelerated the diplomatic process that culminated in German reunification on October 3, 1990, less than a year after the fall of the Berlin Wall.

The victory in Philadelphia stunned the chess world and reignited debate over whether machines could outthink humans at the highest levels of strategic thought. Kasparov ultimately won the 1996 match overall, but the loss foreshadowed Deep Blue's historic 1997 rematch victory, a turning point in the public perception of artificial intelligence.