http://www.ted.com Adam Grosser talks about a project to build a refrigerator that works without electricity — to bring the vital tool to villages and clinics worldwide. Tweaking some old technology, he’s come up with a system that works.

http://www.ted.com Insects and animals have evolved some amazing skills — but, as Robert Full notes, many animals are actually over-engineered. The trick is to copy only what’s necessary. He shows how human engineers can learn from animals’ tricks.

http://www.ted.com Artist Chris Jordan shows us an arresting view of what Western culture looks like. His supersized images picture some almost unimaginable statistics — like the astonishing number of paper cups we use every single day.

http://www.ted.com Historian George Dyson tells stories from the birth of the modern computer — from its 16th-century origins to the hilarious notebooks of some early computer engineers.