There was a science toy in the I think 40s or 50s they came with ACTUAL FUCKING URANIUM.

Edit. Oh, just saw someone else said this already with more in depth info

I forget the name, maybe it was called slip and slide? Water Park at home!

Dangerous if you don’t follow the instructions and easy to get fractures. Like the kids across the street who borrowed it, broke their wrist, and tried to sue us. I’m pretty sure it was ”yeah borrowers parents needed to supervise them".