Something I've never understood about parallel programming/operating systems is how a computer can use less than 100% of its processing power. (This is probably due to the fact that my college OS course was dreadful.)
Asking this question doesn't fit on Stack Overflow (I don't think), because it doesn't fit the "how do I do/fix this?" specificity guideline/requirement. My question isn't open-ended (like "best practices" questions tend to be), as there is a right answer, but I don't know where to ask it.
The answer to this question (the one you're reading) may very well be "not here", and I should ask it somewhere else, like Quora perhaps, but I like the SE community and its website layout/idea exchange methodology.