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The article Ultimate physical limits to computation gives a thermodynamical and statistical mechanics view of computation.. and an upper bound on the number of operations a one kilogram machine can perform.
This course is exciting if you are in computer science.
Starting Strength, the EFS exercise index for bench or squat/dead.
Eric Cressey is an expert on shoulder pain and also has some resources on lower back issues. The expert on knee pain is Mike Robertson, his book bulletproof knees is worth the money.