Makita, Milwaukee and more. We judge each on how well they tackle wood, metal and brick, sink short and long screws, how much they slow down when using larger drill bits and how easy they are to use.

To create the solid electrolyte, the researchers introduced an inert aluminum fluoride salt to the liquid electrolyte already containing aluminum ions.

A stretchy and flexible battery pouch filled with strategically placed holes is more breathable than cotton. That could make it an ideal power source for wearable sports or fitness devices built ...