Nintendo DS

How come a 4 year old and an 8 year old can figure out how to work this little machine, when I couldn't even figure out how to turn it on. I have finally mastered turning it on, inserting a game, communicating with the 2nd DS in the house, and playing some games (at a very low level of course)... but my kids, there is no stopping them. Kevin & I will walk by their bedrooms at night to see this funny glow under the covers... you guessed it, is the DS they are playing. I have even resorted to buying extra games for them from ebay. Wow, this was a pretty amazing Christmas present. Thanks Granny & Popper!