ANDREWS MCMEEL ALMANACToday is the 110th day of 2021 and the 32nd day of spring. TODAY'S HISTORY: In 1902, Marie and Pierre Curie isolated the radioactive element radium for the first time. In 1999, two gun-wielding students killed 12 fellow students and a teacher at Columbine High School in Littleton, Colorado. The Bulls lost 135-131 in double overtime and eventually lost the first-round series, while the Celtics went on to win the championship. TODAY'S MOON: First quarter moon (April 20).