World's Lightest Solid!
AdultsConstructionMediaScience...Aerogels are the world's lightest (least dense) solids. They are also excellent thermal insulators and have been used in numerous Mars missions and the Stardust comet particle-return mission.
Why Are 96,000,000 Black Balls on This Reservoir?
AdultsConstructionDesignScience...I took a boat through 96 million black plastic balls on the Los Angeles reservoir to find out why they're there.