In Prague on August 24, 2006, the International Astronomical Union votes to demote Pluto from the ninth planet from the Sun to one of dozens of known dwarf planets.

Pluto's Planet Status Revoked: The Controversial Vote That Changed Our Solar System Forever

Massive Prime Number Discovered in 1997: A Mind-Boggling 895,932 Digits Long

Company A of the Third Battalion, 196th Light Infantry Brigade refuses the order of its commander, Lieutenant Eugene Schurtz, Jr.

France's 1968 Hydrogen Bomb Test: A Milestone in Nuclear Power and Environmental Controversy

Historic Space Mission: Russian Cosmonauts Make Time Magazine Cover in 1962

Congress passes the Communist Control Act in response to the growing anticommunist hysteria in the United States.

Amelia Earhart’s Historic Milestones: First Woman to Fly Alone Across America and Atlantic

Wealth meant that Cornelius Vanderbilt IV, known as Neil, had the world at his feet. But he chose paths that set him adrift from high society and his family.

The Panama Canal: A Revolutionary Engineering Marvel Connecting Two Oceans