The author of the book once made a Turing machine in Excel [1], which was called out by Microsoft when they made the Excel formula language Turing complete [2].

The author of the book once made a Turing machine in Excel [1], which was called out by Microsoft when they made the Excel formula language Turing complete [2]. [1] https://www.felienne.com/archives/2974 https://www.felienne.com/archives/2974 [2] https://www.microsoft.com/en-us/research/blog/lambda-the-ultimatae-excel-worksheet-function/ https://www.microsoft.com/en-us/research/blog/lambda-the-ult...