Google will start testing a feature this year that uses machine learning to weed out children trying to access adult content on YouTube. The "machine learning-based age estimation model" will try to predict whether a user is under 18 and, if so, apply appropriate age filter settings to their account. The announcement came amid a flurry of Google child safety announcements as the US Senate considers a bill that would ban pre-teens from social media. YouTube CEO Neal Mohan first mentioned the ML age restriction feature on Tuesday in his letter about the platform's "bets" for the coming year. "We'll use machine learning in 2025 to help us estimate a user's age -- distinguishing between younger viewers and adults -- to help provide the best and most age-appropriate experiences and protections," he wrote.

Samsung will add new AI-based health and fitness features to the Galaxy Watch later this year. The company announced on-device AI features on Wednesday, including personalized health scores, tips, sleep indicators and suggested workout routines. One of the Galaxy Watch's big AI upgrades is a new Energy Score, which learns from various personal metrics to provide "comprehensive health insights." The model draws on a variety of sleep data, including when the wearer went to bed, how long and how well they slept and their heart's rate and variability during sleep. Physical activity during waking hours is also taken into account.

The Apple Watch Series 4 is the best smartwatch you can buy. There's no single killer feature that makes the Apple Watch Series 4 (as tested: 40mm with GPS and GPS/LTE), our pick for best smartwatch. It's the fact that it does almost everything better than every other smartwatch we've come across. That it can be used as a minimalist device, for keeping abreast of your smartphone notifications, or as an all-in wearable that will let you take or make phone calls, send text messages, navigate through a crowded city and listen to music without bringing your cellphone with you (provided you spring for the GPS/LTE version) is the icing on the cake. Setting up the Apple Watch to work with your iPhone is almost effortless. Using this watch, with its responsive OLED touchscreen display and rotating Digital Crown (Apple's marketing mumbo jumbo for the knob on the side of the watch) is just as easy. You can use your finger to navigate apps and menus, scroll through text with the Digital Crown or ask Siri to do some hands-free heavy lifting for you.

Of all the annual meetings of tech-obsessed minds, IFA is perhaps the most unpredictable. You know everyone and their mother is going to CES to set the tone for the year, and MWC is all things mobile. At IFA, though, you never quite know what surprises lurk behind the floor-to-ceiling displays of kitchen appliances that dominate the halls of the sprawling Messe Berlin conference center. History and rumors give us some idea, however. Naturally, we'll be on the ground to bring you all the important news, but these are some of things we expect to see announced at this year's show.

The next iPad Pro is eagerly anticipated. There are now plenty of suggestions of what it might look like and how it might work. Analyst Ming-Chi Kuo has predicted that it will have Face ID. A leak suggested it may remove the headphone jack. A not-quite-persuasive render suggested that the Smart Connector might move to the back of the device.