LRO - I am thinking your son may well actually know more than us! You look too yooung to have a 16 yo son - wowza... 9 kcals a teaspoon? So, on average we burn 1kcal per min when we sedentary (sp?) so the 9 minutes of avereage it takes (9 seconds in my case) for them to fall asleep after while we sit patiently waiting for some sort of thanks - or, wow that was brilliant, is how long it take for us to shift it! Hahahaha x