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When I was a kid (early 80's) we used to go to the "Science Center" in Baltimore, Maryland (US). There were a lot of cool interactive displays/experiments. One
by mojomark 6y ago
When I was a kid (early 80's) we used to go to the "Science Center" in Baltimore, Maryland (US). There were a lot of cool interactive displays/experiments. One was a fan blowing under an orange street cone, and a levitating beach ball would hover in mid air - caught in what appeared to be an invisible tractor beam. You could walk up, pull the beach ball off, then place it (or throw it) back into the vortex. It was quite stable. I used to play with that for about 20 minutes straight I'd say each time I went there, which was often.