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Re:KiwiCo Eureka Crate: Monthly Science Kit Subscription by paulchap on Saturday June 27, 2020 @08:11AM (#23661298)
Found it! Things of Science: http://ecg.mit.edu/george/tos/ for the price of 5$/year.

[edit: looks like I misremembered though, neither the Make article nor the website mention radioactivity... must have got it mixed up with something like this: https://en.wikipedia.org/wiki/Gilbert_U-238_Atomic_Energy_La...]

Re:KiwiCo Eureka Crate: Monthly Science Kit Subscription by ementi on Saturday June 27, 2020 @09:03AM (#23661592)
Nice! Thanks for digging into that