Spire’s health tracker sticks on clothes and never needs charging

Wearable fitness monitors promise a lot but research shows that nearly a third are abandoned in junk drawers because they're too fiddly, require too much maintenance or users are simply forgetting to put them on. Health monitoring company Spire think...

Matrix PowerWatch hands-on: The promise of a world without chargers

When Matrix co-founder Douglas Tham handed me my review unit of the PowerWatch, I had to fight the instinct to ask for a charger. This thermal-powered wearable doesn't need one -- it gets energy by converting your body heat into electricity. It's bee...