For some reason or other my dad acquired a very large jug of mercury, as a kid I remember him letting us play with it it. We'd pour a bit out, manipulate it with magnets and then we would take pennies and rub the mercury all over them with our barehands to make them look like dimes.
There was also the chucking of pure sodium into puddles to watch it ignite, and being taught how to make good smoke bombs, and getting magnesium shavings to burn by milling large bars of magnesium with a milling machine.
But it wasn't always safety first, there was the handling of large amounts of lead solder and soldering without any kind of fume hood, working milling machines, lathes, bench presses, etc during summer breaks from high school.
I watched "the cove" last night, I should probably get tested for mercury levels.
We roamed everywhere too, latchkey kids with nothing to do, just walk to the lake and go swimming or walk along the railroad tracks and hope you can get a train to roll over a penny to flatten it.
I disagree about playground equipment, there are still merri-go-rounds in the city (downtown by Memorial Park, and some school by Macewan Park). Anyway, I am pretty sure you could damage yourself falling from equipment or falling on equipment. Plastic slides also get pretty hot in the sun, and there are still a lot of the metal slides too.
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