Plus: Short-selling firm Hindenburg Research said the videogame platform Roblox has reported inflated user metrics to investors and has favored growth over child safety. Roblox said its platform is safe. The Nobel Prize in physics was awarded to a pair of scientists for their discoveries and inventions that formed the building blocks of machine learning. J.R. Whalen reports.\n\n\n\nSign up for the WSJ's free What's News newsletter.\xa0\n\nLearn more about your ad choices. Visit megaphone.fm/adchoices