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<p>Because when you get stuck on a problem on your own, you spend about an hour beating your head against the wall, and you don’t really learn anything… You just get frustrated and you think about the same (wrong) process over and over. Eventually, you understand what you were doing wrong, and you feel like an idiot for having wasted all that time on an entirely wrong thought process, and you continue your calcs.</p>
<p>In a group, the time that is spent head-beating is significantly less because when you get stuck, everyone starts throwing out their (wrong) ideas, and while discussing it, all those wrong ideas cause someone to stumble across the right one. In my experience in the harder classes I’ve taken, it was a different person pretty much every time, so it really was a group effort.</p>
<p>None of us is as smart as all of us.</p>