Exploratorium - StumbleUpon. Want to melt those years away?
We've got a list of 11 mostly affordable gifts that are guaranteed to blow your mind, whether or not you're a science geek. Click on any image to see it enlarged. 1. Aerogel Also known as frozen smoke, Aerogel is the world's lowest density solid, clocking in at 96% air. Shuttle-Endeavour-sts130-nuit.jpg from laboiteverte.fr - StumbleUpon. Armstrong.jpg from harvard.edu - StumbleUpon. AP15_8.jpg from usgs.gov - StumbleUpon. Hires.jpg from harvard.edu - StumbleUpon.