Aerogel

Aerogel is one of the most impressive materials humans have created so far.  

Comes in a 1oz vial (approximately 1 heaping handful) of silica aerogel particles—the world's lightest known solid material.

Commonly called "frozen smoke", it is safe to touch, hydrophobic (repels water), and an outstanding insulator. This is one of our most popular items and essential for any science enthusiast's

Due to its high porosity, NASA has even used aerogel to collect interstellar dust particles in outer space. 

Includes a detailed info card.