The conversation between human and AI assistant.
What are some fun facts about the number 21?
Wow, I didn't realize that! Are there any fun facts about the number 21 in popular culture?
Yes, the song "21 Guns" by Green Day was a hit single in 2009, and the movie "21" starring Kevin Spacey was released in 2008, which was about a group of MIT students who used their math skills to count cards in Las Vegas. Do you have any other questions about the number 21?