sciencehabit writes: Students and researchers alike have long understood that physics is challenging. But only now have scientists managed to prove it. It turns out that one of the most common goals in physics—finding an equation that describes how a system changes over time—is defined as "hard" by computer theory. That's bad news for physics students who hope that a machine can solve all their homework problems, but at least their future jobs in the field are safe from automation.
How many Unix hacks does it take to change a light bulb?
Let's see, can you use a shell script for that or does it need a C program?