Whether you're training for a marathon or looking to lose a few pounds, our favorite smart scales can effortlessly track your weight, body fat, bone density, water percentage, heart rate, and more.

If you hate losing stuff — your keys, backpack, jacket, purse or just about anything else — a Bluetooth tracker can help. These little tags pair with your smartphone so you can make your keys chirp ...

† Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 ‡ Interdisciplinary Graduate School, ...