[Ernie]

I agree with you Less, the thermos flask is really a smart piece of kit, but I am sure you will all agree that the smartest is the Aspirin/Paracetamol tablets in fact all of the pain killing preparations. For example you have a headache and you take two of these wonderful tablets and within half an hour or so there are signs of improvement, how does the tablet know your head is hurting in the first place?..