1. On May 20, 1874, Levi Strauss & Co. received a patent for their blue jeans. The company, founded by Levi Strauss in San Francisco, eventually became one of the most iconic and successful clothing brands in the world.

2. May 20, 1927 marked the start of American aviation history, as Charles Lindbergh successfully completed the first solo non-stop flight from New York to Paris. The flight covered more than 3,600 miles in just over 33 hours, and made Lindbergh an instant celebrity.

3. In 1975, the Boston Celtics won their 13th NBA championship on May 20, defeating the Golden State Warriors in Game 6 of the finals. The Celtics, led by John Havlicek and Dave Cowens, cemented their place as one of the greatest dynasties in sports history.

4. May 20, 2015 saw the opening of the first phase of the Boston Greenway, a 1.5 mile linear park that runs through the heart of the city's downtown. The park, created from land previously occupied by an elevated highway, features public art installations, gardens, and gathering spaces.

5. On May 20, 1989, the largest civil jury award in US history was announced in Boston. A jury awarded $8.6 billion to the Pennzoil Company in a lawsuit against Texaco, stemming from alleged interference with a merger between Pennzoil and Getty Oil. The award was later reduced on appeal, but remains one of the most famous and controversial court cases in US history.