It's been a long time since I was actually inspired enough by something that I learned in school to post about it. I think Cognitive Dissonance, a term coined by Leon Festinger, which is the idea of conflict existing in your mind between either ideas, or an idea and your current lifestyle is worthy of mention though.
If you know that not sleeping is bad for you, but you make the choice to not sleep, that is cognitive dissonance. That's just one example. You can apply it to almost any subject.
Some people can apparently tolerate rather high levels of cognitive dissonance while others can tolerate less. I like to think that I can tolerate very little of it, but that may be inaccurate.
Here is some from my own mind. I kind of agree with both of these articles:
In Praise of Capitalist Inequality
Fix Education, Restore Social Mobility
This is an issue––or rather set of issues––is one I've been struggling with for a while. I've even interviewed people from both sides of the issue about it. But I can't decide.