[kareemm]

These are genius. Thanks for sharing. I'll definitely be sharing w/ my kids when they get old enough. What's your take on the lower bound where kids are generally capable of figuring these out?

[geek_at]

I was using this with the youngest kids in our school which were like 11 but for real learning benifit I'd recommend 13 and up

[Mezzie]

It's going to depend on the kid. I was doing this sort of thing at 4 or 5.