The conversation between human and AI assistant.
Magic (illusion): How does David Blaine or other magicians guess the number / card that you are thinking of?
That makes sense. I've also heard that sometimes they use marked cards or devices to help them guess the card. Do you know anything about that?
Yes, marked cards are a common technique for cheating in card games, but they can also be used by magicians to help them identify specific cards. Some magicians may also use electronic devices that can help them track cards or communicate with an accomplice who knows the participant's card.