For a longer read, I can highly recommend the book "The Man from the Future" by Ananyo Bhattacharya. It's quite an easy read and extensively discusses the life and discoveries by John von Neumann in chronological order.
I had to frequently pause my read to research a discovery in more depth to understand the significance of it and I got a chuckle when he marries his childhood sweetheart because she got no mention prior to that point in the book.
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