1) The NBA (National Basketball Association) is widely regarded as one of the most popular and competitive professional basketball leagues in the world.

2) The first successful human heart transplant was performed by Dr. Christiaan Barnard in 1967.

3) The first commercially successful video game was "Pong," released in 1972 by Atari.

4) The Civil Rights Act of 1964 in the United States outlawed discrimination based on race, color, religion, sex, or national origin.