Using flat materials and intricate patterns, researchers have built a self-folding robot that, once assembled, can crawl and turn.

Nine billion people are expected to inhabit the Earth by 2050. But while the world population is growing, the amount of available cropland, fresh water and other key resources is not. The number of undernourished people already exceeds one billion—how do we feed the world without exacerbating environmental problems and simultaneously cope with climate change?