Yes, you read it right. Electrical Engineering professor Smitha Rao from the University of Texas in Arlington have designed a micro-windmill that generates wind energy capable to recharge cell phone batteries.
The size of windmill is about 1.8mm (at its widest point). To give you an idea, a single grain of rice could hold of about 10 tiny windmills, according to the report.
These tiny windmills will be attached to the cell phone sleeves. The windmills catch up winds from waving the cell phone or by holding it up to an open window.