Psychology has a replication problem. Since 2010, scientists conducting replications of hundreds of studies have discovered that a dismal amount of published results can be reproduced. This realization by psychologists has come to be known as "replication crisis". For me, this story all started with ego-depletion, and the comics I had drawn about it in 2014. The idea is that your self-control is a resource that can be diminished with use. When you think about all the times you've been slowly worn down by temptation, it seems obvious. When I drew the comics, there had been new research pointing to blood sugar levels as the font of self-control from which we all drew from. It also made sense—people get cranky when they're hungry. We even made up a word for it. We call it being "hangry".