1. In 1941, the Denver Post inaugurated the "Easter Seal Drive" in Colorado in an effort to raise money and awareness for people with disabilities. This tradition continues to this day, with numerous Colorado organizations participating in the annual fundraising campaign.

2. On April 11, 1970, Apollo 13 was launched from the Kennedy Space Center in Florida. Colorado played a key role in the mission, as the Manned Spacecraft Center (now known as the Johnson Space Center) in Houston relied on telemetry data from Colorado State University's Cooperative Institute for Research in the Atmosphere to monitor the health of the crew during their perilous journey to and from the moon.

3. In 2013, a massive blizzard dubbed "Winter Storm Xerxes" hit Colorado on April 11, dumping up to 2 feet of snow in some areas and causing widespread power outages and transportation disruptions.

4. On April 11, 2005, Colorado Governor Bill Owens signed a landmark law legalizing the use of medical marijuana in the state. This paved the way for the eventual legalization of recreational marijuana in Colorado in 2012.

5. In 1885, mining magnate Horace Tabor married his second wife, Elizabeth "Baby Doe" McCourt, in a lavish ceremony at Denver's historic Windsor Hotel. The couple's extravagant spending and scandalous behavior became the talk of the town, and their story has since become a colorful chapter in Colorado's rich history.