“Too little reward and the animal becomes frustrated and stops trying; too much and it won’t push the lever as often.” In The Verge, Andrew Thompson looks at how the makers of slot and video poker machines managed to turn gaming into crack (and how the tech industry is learning their tricks): The Engineers of Addiction. I wouldn’t necessarily qualify myself as an addict, but the last time I played video poker, my FitBit thought I walked to Nairobi.