3. Super Elastic Bubble Plastic. It consisted of a tube of viscous plastic substance and a thin straw used to blow semi-solid bubbles. A pea-sized amount of liquid plastic was squeezed from the tube and made into a ball. Besides the potential for spills when liquid plastic was handled by children, the substance also emitted noxious fumes. The fumes could become concentrated inside the straw, making it dangerous to inhale through the straw while inflating a bubble. The toy was not recommended for children under 5. Because of these problems, Super Elastic Bubble Plastic was eventually discontinued. Was this a toy from your childhood?

4. Gilbert U-238 Atomic Energy Laboratory is a toy lab set designed to allow children to create and watch nuclear and chemical reactions using real radioactive material. The set came with four samples of uranium-bearing ores (autunite, torbernite, uraninite, and carnotite), as well as a Geiger-Mueller radiation counter and various other tools. Did you get to play with this till it was banned?

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