1. California Statehood: On April 3, 1850, President Millard Fillmore signed a bill that officially admitted California as the 31st state of the United States. By becoming a state, California gained more representation and control over its own affairs, paving the way for its future growth and development.

2. Environmental Protection: In 1970, on this day, the first Earth Day was celebrated across the United States, including California. Initiated by Senator Gaylord Nelson of Wisconsin, Earth Day was aimed at raising awareness and promoting environmental protection and conservation efforts. It ultimately led to the creation of the Environmental Protection Agency and the passage of major environmental laws.

3. Medical Advancements: On April 3, 1941, Dr. Leonard Bailey was born in Hanford, California. He later became a renowned surgeon who performed the world's first infant heart transplant in 1984. Bailey's pioneering work helped pave the way for advances in pediatric cardiac surgery and saved countless lives.

4. Hollywood Achievement: On this day in 1930, the Academy Awards were held at the Ambassador Hotel in Los Angeles, California. The first ever Best Picture award was presented to the film "Wings," which was directed by William A. Wellman. The ceremony marked the beginning of an iconic tradition that has since become known as the Oscars.

5. Sports Legacy: On April 3, 2016, Kobe Bryant played his last game as a member of the Los Angeles Lakers. The game was played at the Staples Center in downtown Los Angeles and was a fitting send-off for one of the greatest players in NBA history. Bryant scored 60 points in the game, helping the Lakers secure a victory and ending his career on a high note.