I traveled to Roblox's headquarters to do a demo of a new safety feature it says will help protect child users.

Roblox’s new facial age-verification system, initially viewed as a risk to engagement, may instead bolster the platform’s reputation for safety and privacy, according to Morgan Stanley.

Roblox is introducing new age-verification tools for users who want to chat that come into effect in January. Do kids think it will work?

On a monitor in a dark room, artificial intelligence draws a pale circle to highlight a possible cancer. “It’s a reminder of, ‘Hey, go take a second look at this area just to be sure,’ ” Dr. Rachel ...