Tiny, wearable generator charges itself using body heat
Get ready to wear green energy on your wrist
Can fitness bands predict COVID-19 infection before you show symptoms? Probably not
WHOOP's wearables make strong claims — but the science is still weak
Your clothes might soon contain tiny generators to charge your electronics
Never plug in your Fitbit or Apple Watch again
Why you shouldn't believe everything your sleep tracker tells you
People who are told they slept poorly will act accordingly, even if it isn't true