When was the last time you enjoyed a good chocolate milkshake? Maybe that should change to today, because it's National Chocolate Milkshake Day! Today is also National Day of Encouragement Day! I will celebrate this day by telling Jordan Schafer great job!!! after he records an out. Today is also National Video Games Day! What was the last video game you played? Finally, on this day in 1933, Hungarian physicist Leó Szilárd conceives the idea of nuclear chain reaction with atoms.. This was later developed to be atomic bombs.