Spore-powered engines zoom ahead
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/06/ticker_Moisture_Mill_1.jpg?fit=860%2C460&ssl=1)
This spore-powered engine is called a "moisture mill." It turns as bacterial spores, attached to the yellow polymer flaps, shrink and swell based on varying levels of humidity.
Joe Turner Lin
This spore-powered engine is called a "moisture mill." It turns as bacterial spores, attached to the yellow polymer flaps, shrink and swell based on varying levels of humidity.
Joe Turner Lin