Humanity's First Glimpse of Mercury (1974)
On March 29, 1974, NASA's Mariner 10 became the first spacecraft to fly past Mercury, revealing a cratered, moonlike world no telescope had ever resolved.
Tales from the year 1974
Hank Aaron Hits No. 715, Tops Babe Ruth
On April 8, 1974, Hank Aaron's 715th home run broke Babe Ruth's record before 53,775 fans in Atlanta, ending a chase shadowed by racist hate mail.
The Song That Toppled a Dictatorship
On April 25, 1974, two coded songs on Portuguese radio launched the Carnation Revolution, ending nearly 50 years of dictatorship in under a day.