especially for those diseases that don't occur until one or two thr yea-- autism beinone,erhaps rett syndrome and other disorders. so that's another thing. >> take the time to enjoy your child. do it not only for your child, because i fully agree with everything that pat said. you are the best environment for your child to be growing up in. but do it for yourself. this is an absolutely fascinating time in life, and a time when things are changing so fast that, from one day to the next, from one week to the next, you're dealing with a different creatures, with new abilities. take the time to enjoy them. >> rose: let me then ask finall what is... what do you moswant to know within your field? what's the biggest question you would like to see answered? >> to answer that honestly, i'm going to have to turn away from questions about parents and children, and say that the question i'd most like to have the answer to is how is it possible for a human brain to think an abstract thought? you've learned on this program, you've talked about how the brain only gets input from its perceptual syst