This means that having a low IQ doesn’t only make you more likely to get killed or fall victim to an accident. It also means you’re more likely to undergo difficulties in progressing up every ladder in life. You’ll often feel permanently ‘stuck at zero’—unable to improve or change your position. Most of us will experience this feeling at least a few times in our lives, whether encountered in school (being unable to break the ‘A-grade’), in our social lives (being unable to establish or maintain a successful romantic relationship), or in comparatively trivial areas. Yet most of the time, it is transient—passing when we switch our efforts to a new endeavor, or after devising a way to solve the problem. Very few of us know what it is like to have that feeling almost all of the time—to have a large proportion of one’s attempts at self-betterment or advancement frustrated by forces that seem to be beyond our control. Being trapped in such a dismal psychological state for only a brief interval can lead to anxiety, depression, or dependence. In some, this feeling of ‘being stuck at zero’ (that the world is manifestly unfair and against them) will lead to resentment—and resentment can turn into murderousness.