My best-niece is turning 3-years old today!  She's my shining light.  When she was about 1-year old she'd just sit there and stare at me as I'd converse with her.  I believe in enriching a kid's mind from the get-go. I'd tell her to say, cat, or dog, or sun, like these easy 1 syllable words, and then I'd just randomly throw in something like molecular biology and she'd bust up in a giggle. 

That was then.  Now that she's three, she's doing all the teaching.  She tells me where things are, how things work, how to do certain things, and she even psycho-analyzes me from time to time, haha.  I don't think when I was three I was able to distinguish the difference between iPhone and Droid and play with an iPad regularly either. :)  My, my, times have changed.

Ka