I'm 18 and founded an AI startup. I have to wake up at 3 a.m. to work on it before school, but it's worth every sleepless night.

Alex Yang details founding an AI startup with other high schoolers worldwide to improve Alzheimer's diagnostics.

What makes goal-setting apps motivate—or backfire?

With the new year approaching, millions of people will turn to apps to help them get fit, save money or learn something new.