Fort. Yuri. John. Some historic four letter words, today.
150 years ago, the opening shots of the US Civil War were fired against Union troops inside Fort Sumter.
50 years ago, Yuri Gargarin became the first man in space as he launched aboard Vostok 1.
30 years ago, Shuttle Columbia flew for the first time with commander John Young and pilot Robert Crippen at the controls.