Thanks for making me smile but actually it's not a bad idea to open children quite early to the concept of functions and related ideas. Of course you wouldn't u

Thanks for making me smile but actually it's not a bad idea to open children quite early to the concept of functions and related ideas. Of course you wouldn't use the name "function", but rather a "machine" - and then play the "what comes in, what comes out" game, for example. The ability to correlate two (and more) variable changes is very useful in life, but spotting these occasions and use them to point out certain facts involves some skill on the parents' part.