One of the best professors I ever had, when talking about intractability, would always begin his lectures by pointing out that there are only about 10^80 elemen

One of the best professors I ever had, when talking about intractability, would always begin his lectures by pointing out that there are only about 10^80 elementary particles in the universe. He has a small essay online about the subject: https://www.utdallas.edu/~tfarage/MyPapers/TheBestComputerEver.htm https://www.utdallas.edu/~tfarage/MyPapers/TheBestComputerEv...