My son is a bit obsessed with the rubix cube.  He has what is called a ‘speed cube’ and has gotten so good at it, he can solve it in under a minute (his fastest time being 44 seconds!) – yes, 44 seconds.  I have yet to solve it at all.  He and his buddies sit around working on rubix cubes for fun…My son is a geek and I could not be prouder!  I love the way his mind works.  Whatever your kids are into – enjoy their wonder and encourage their passions!