Critical thinking is great, but only if you have two competing theories...
If we had say Evolution (which can be observed, predicted and studied) and Flying Spaghetti Monsterism with proof that flying spaghetti monster currently or did exist and that it had powers beyond that of a normal flying spaghetti monster then we might need to teach both and let the kids decide. However if like gravity there is 1 theory (don't think there is a second plausible one yet) and its pretty reliable or at least reliable enough to represent a good analogy at that level (Transistors are switches for example... ) then that is the only thing we should be teaching as truth, any other wack theories should be that, wack theories possibly mentioned in passing.
Children are easily confused... if you preach to them that gravity is caused by the spaghetti monster's children who bind things together using their special invisible meatball sauce then you will likely get some converts and at best simply a few confused children.
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