Stumped

I think that I need to go back to school. Rosie is moving away from the usual 'Why' which plagues us for the first 4 or so years of a child's life. She's getting smarter and so are her questions. After breakfast this morning, at a mind numbingly early 6.45 a.m. she said to me that she had a very important question to ask. Floundering, I imagined that some sort of heaven vs hell or birds and bees analysis was to follow.... "Go on", I encouraged. "Why doesn't water just slip down your throat when you drink it?". I assured her that it does just slip down your throat. "No it doesn't, you have to swallow." I tried to recall my biology lessons of 20 years ago and managed to dredge something about having a valve that stops stuff going into your lungs and allows stuff only into your stomach when you swallow. That's why you cough when something 'goes down the wrong hole'. "That's rubbish", she replied. "You don't have to swallow candy floss, it just melts and slips down your throat so why doesn't water?". Hmmm, defeated by spun sugar. I briefly considered making this an afternoon project of internet searching and a trip to the bookshop to find a human biology encyclopedia suitable for a five year old but in the end said what any mum with a shred of self respect remaining in the face of daughter disdain at her lack of answers would say...."Ask your teacher, she knows everything."