BlackRock launched an ETF that limits Bitcoin gains in exchange for double-digit payouts by selling call options on its ...

A seemingly simple set of rules kicks off a kind of mathematical magic trick, which has kept great minds busy since the 1930s ...

In 1946, the mathematician Paul Erdős posed the unit distance problem—and suggested a winning strategy. An A.I. model has now ...

Reddit users with smaller wrists say the Fitbit Air’s “one size fits all” design feels oversized and leaves noticeable gaps around the skin. Some users suggested wearing the tracker on the bicep or ...

The switch from Fitbit to Google Health was announced earlier in the month, began rolling out a few days ago as an app update, and basically completed over the weekend thanks to Fitbit Air orders ...

Commentary: Trying out Google's new Gemini-powered Fitbit makes me wonder if this is the killer companion for Google's upcoming glasses. I bet it will be. I started with CNET reviewing laptops in 2009 ...

I’m PCMag’s senior writer covering smart home and wearable devices. I’ve been reporting on tech professionally for nearly a decade and have been obsessing about it for much longer than that. Prior to ...

It’s finally happened! After years of begging for their return, screenless fitness trackers are back, at least in the form of Google’s new Fitbit Air. I’ll admit, I didn’t expect Google to be the one ...

After months of Public Preview testing, Google is replacing the Fitbit app and launching “Google Health.” It’s meant to bring “together the best of Fitbit’s pioneering spirit with the helpfulness of ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Add as a preferred ...