On This Day: April 12

3 verified moments happened on April 12. Here they are in the order they actually happened — the same kind of puzzle you solve in Whensly every day.

1. 1955💉 Scientists announce in Ann Arbor that Jonas Salk's polio vaccine is safe, effective, and potent.History · Source: University of Michigan; History.com (Apr 12 1955)
2. 1961🚀 Yuri Gagarin orbits Earth aboard Vostok, becoming the first human to travel into outer space.History · Source: Wikipedia, 'Vostok 1' (Apr 12 1961)
3. 1965 The Philadelphia Phillies beat the Astros in the first regular-season game played in the Houston AstrodomeSports · Source: https://sabr.org/gamesproj/game/april-12-1965-phillies-win-first-regular-season-game-in-the-astrodome/