Aerogel, the synthetic material made of about 1% microporous silica and 99% air, has extremely low density, extremely low thermal conductivity, and extremely low chances of turning out OK when made in a home lab. It took YouTuber NileRed many months of trial and error.
He says his efforts were inspired by an aerogel video by Versitatium (previously)
Image: YouTube / NileRed
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