1. 1885: Mark Twain’s “Adventures of Huckleberry Finn” is published in the United States.

2. 1930: Pluto is discovered by astronomer Clyde Tombaugh at the Lowell Observatory in Flagstaff, Arizona.

3. 1970: The Chicago Seven defendants are found not guilty of conspiring to incite riots at the 1968 Democratic National Convention.

4. 2001: Dale Earnhardt, a NASCAR racing legend, dies in a crash during the Daytona 500.

5. 2003: Nearly 200 people are killed in a nightclub fire in Rhode Island during a performance by the band Great White.

6. 2005: The Kyoto Protocol, an international treaty aimed at combating global warming, comes into force.

7. 2021: NASA’s Perseverance rover successfully lands on Mars, beginning its mission to search for signs of past life and collect samples.