Scientists have created the world’s lightest solid a material so light it’s almost entirely empty space. Despite its weight, it is still a true solid with a defined structure. This video explains how ...

This is aerogel, the world’s lightest solid, and it behaves in ways that seem almost impossible at first glance. It is made ...

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. The ...