What if smartphones had a robotic limb ? Many inventions start with a question that nobody else had ever thought to ask. Few of them end up being quite as creepy as MobiLimb.

Created by Marc Teyssier at the University of Paris-Saclay in France and his colleagues, MobiLimb looks like a mechanical finger, with knuckles that let it bend and beckon. The appendage plugs into the USB port on your smartphone or tablet and can be used as an additional way to interact with your device. …