I already own a chunk of aerogel (aka "frozen smoke"), which I pull from its little plastic container every couple of years to marvel at. I keep it in a bedside table drawer that's become my de facto cabinet of curiosities. My next addition to the cabinet is a chunk of gallium, because it's a metal that liquifies at 85.59°F so it will melt in your hand. It's not extremely toxic, like mercury, which I played with a lot when I was a kid, anyway.
I've been interested in gallium after reading that some people make practical joke spoons with gallium that melt when you place them in a hot beverage:
Amazon has a 20g piece of gallium for $(removed) (including shipping) and one Amazon reviewer said it the size of 3 quarters.
Astronaut David Scott re-created, in 1971 during the Apollo 15 mission, Galileo’s “falling bodies” experiment by dropping a hammer and feather on the moon at the same time. Simply, both fell at the same rate because there was no air resistance. screengrab via Wonders of Physics/YouTube (Digg)
“Test counts inflated, death tolls deflated, metrics shifted.”
IMGURian @KRANKARTA6 did an awesome topography visualization project in the “Ridgeline Style” that reminds us of the album cover for Joy Division’s classic LP ‘Unknown Pleasures.’
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