Everyone wants to be happy, but happiness can be frustratingly hard to achieve. Even when you get exactly what you want, you often end up feeling less happy than you thought you would, and what happiness you do feel is fleeting. What's up with that? In the Yale course The Science of Well-Being on Coursera — which has been taken by more than 300,000 people and stands as Yale's most popular course — Yale psychology professor Laurie Santos explains the annoying biases we all hold that hinder our happiness, then explains how we can overcome them. Check out the biases below, then find out how you can work through them in her free Coursera course.