★★★★★
Gagarin becomes the first human in space
Soviet cosmonaut Yuri Gagarin orbits the Earth aboard Vostok 1, becoming the first human in space.
ExplorationTechnology· Russia, Kazakhstan
- 1961
- 1955★★★★★
Salk polio vaccine declared safe and effective
Results of a mass field trial show Jonas Salk's polio vaccine to be safe and effective, opening the way to mass vaccination.
ScienceDisease· United States - 1861★★★★★
American Civil War
War between the Union and the seceding Confederate states, centred on slavery, ending in Union victory and the abolition of slavery.
War· United States - 1861★★★★★
Battle of Fort Sumter
Confederate forces bombard Fort Sumter in Charleston Harbor, South Carolina, opening the American Civil War.
War· United States