How Boeing makes airplanes in the largest building in the world

Amongst the amazing features of this biggest of all buildings, is that it requires no heating or cooling, although it does require an air circulation system to prevent clouds from forming near the ceiling!

http://dvice.com/archives/2012/01/how-boeing-make.php

/ Everett /

Non-billboard in Washington advertises nothing but clean air

http://inhabitat.com/non-billboard-in-washington-advertises-nothing-but-clean-air/#more-292271