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mikejuk writes "This video will change the way you think about programming. The argument is clear and impressive — it suggest that we really are building programs with one hand tied behind our backs. Programmers can only understand their code by pretending to be computers and running it in their heads. As this video shows, this is increadibly inefficient and, as we generally have a computer in front of us, why not use it to help us understand the code? The key is probably interactivity. Don't wait for a compile to complete to see what effect your code has on things — if you can see it in real time then programming becomes much easier."