In this book Randall Munroe uses line drawings and simple explanations to describe interesting stuff. The stuff includes: food-heating radio boxes (microwaves), tall roads (bridges), computer buildings (datacenters), shared space house (the International Space Station), other worlds around the sun (the solar system), flat rocks we live on (tectonic plates) and the bags of stuff inside you (cells). The book goes into how this stuff works and where it comes from? Also, it goes into what would life be like without them.