Here is a possible concise summary:
Michael shows how to use a marked deck of cards to perform a magic trick where he can guess any card chosen by texting his assistant Jack, who is locked away in another room. He explains the secret code he uses to communicate the suit and value of the card through the punctuation, greeting, and name placement in his texts. He also demonstrates a math trick called the Down Under Deal, where he can predict which card will be left after repeatedly dealing down and under from a pile. He reveals the formula that determines the position of the final card based on the number of cards and the nearest power of two.
Here are the key facts extracted from the text:
- The text is a transcript of a video called Michael's Math Magic by Vsauce.
- The video shows how to use a marked deck of cards to perform a magic trick with an assistant in another room.
- The video explains the secret code that is used to communicate the identity of the card through text messages.
- The video also demonstrates another magic trick called the Australian Shuffle or the Down Under Deal, which uses binary sorting to predict the last card left.
- The video provides links to learn more about the math behind the tricks and poses a challenge to the viewer.