Sulfur hexafluoride

The times they are a-changin’.

This post seems to be older than 17 years—a long time on the internet. It might be outdated.

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Sulfur hexafluoride. 5.11 times as dense as air. Freaky!

“Any sufficiently advanced technology is indistinguishable from magic.” – Arthur C. Clarke, Clarke’s three laws

via BoingBoing