The Space Shuttle Columbia with astronauts John Young and Robert Crippen completed the STS-1 mission, launching on April 12 and returning to Earth on April 14. It was the first time a manned reusable spacecraft had returned from orbit.
The first Coca-Cola bottling plant in China was opened.
And a minor league baseball game between the Rochester Red Wings and the Pawtucket Red Sox at McCoy Stadium in Pawtucket, Rhode Island, became the longest professional baseball game in history: 8 hours and 25 minutes/33 innings (although the 33rd inning was not played until June 23).
And these were the top 5 songs on the Billboard Hot 100 chart for April 18, 1981:
#5 – John Lennon – Woman
#4 – Grover Washington, Jr. f/Bill Withers – Just The Two of Us
#3 – Sheena Easton – Morning Train (9 to 5)
#2 – Blondie – Rapture
#1 – Hall & Oates – Kiss On My List