#17 "The super strong material that’s 7.5 times lighter than air" vs "it’s only 1.5 times denser than air". If it would be lighter than air it would float in air like baloon with hel.
Magnetic putty contains tiny micron-sized micro magnets that get charges when around a magnet. You can see it in a speed-up time-lapse video here. It’s also sold as a toy.
#17 "The super strong material that’s 7.5 times lighter than air" vs "it’s only 1.5 times denser than air". If it would be lighter than air it would float in air like baloon with hel.