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An intriguing subject....! A couple of questions I need help with to explain some demos... 1. Why does orange juice taste bitter after you brush your teeth? I read that it was because the foaming action of toothpaste blocked the sweet receptors on your tongue and so all you could taste was the citric acid. However if this is the case, why do mint sweets or chewing gum do the same thing when they don't foam? 2. Can anyone explain why, when you stand in a doorway and press the backs of your hands hard against the door frame for 60 seconds or so, then step forward and relax, your arms float upwards? Please help! Thanks Wendy Sadler Techniquest %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%