Stolen idea

1. Grab the nearest book.
2. Open the book to page 123.
3. Find the fifth sentence.
4. Post the text of the sentence in your journal along with these instructions.
5. Don’t search around and look for the “coolest” book you can find. Do what’s actually next to you.

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I'm not sure about point 5 but it's still an interesting diversion. Here's what I came up with: "If all physical systems are computers, and if computers can perfectly mimic all physical systems, the what distinguishes the real world from a simulation?"