We just have to remind them when they're older and are running things and building amazing stuff that it's NOT OK to blow up other people's stuff with tnt.
And yes, you can take apart a cell phone or a tv or whatever. But the risk:cost ratio isn't nearly as favorable as it was for the previous few generations. The chance of irreversibly breaking it is far higher, and the chance you'll learn very much by just looking are much lower. Likewise, nobody's stopping you from wrapping wire around magnets to make your own memory... but it's not like that's a "thing" kids get exposed to now. But it's all there in minecraft.
(It's also seriously hard to find children's science kits worth buying as the culture of extreme protection of children have turned them into junk. This is one of the only frontiers I'm aware of that's open to children (without the guiding hand of a science-mentor) to learn and play and create in this way)
Now it's all digital. Everyone is buying their 7-year-old a copy of IDA Pro these days.
I've never understood why people think gaming or play ever forms the justification or basis for learning. Decade of nonsensical "gamification" studies has had zero effect no matter what Jane McGonigal says.
Might get an interest or passion going but it has near-zero lasting educational value.
http://en.wikipedia.org/wiki/Overjustification_effect for a summary
And quit downvoting.