Rechargeable, hands-free reading lights were among the most popular HuffPost reader buys during the holiday gift-giving ...

A prosthetic hand that weighs about half that of a human hand also enables wearers to carry out intricate tasks, such as tying knots ...

Light travels incredibly quickly. But just how fast is it? Microwaves and light waves move at the same speed, so if you have a microwave oven, you can work out the speed of light yourself ...