An app called Skill Roulette where users can generate a micro-challenge that gives users a quick, fun skill to try—like drawing with your non-dominant hand, reciting a tongue twister, or solving a riddle.

An app called Skill Roulette where users can generate a micro-challenge that gives users a quick, fun skill to try—like drawing with your non-dominant hand, reciting a tongue twister, or solving a rid...