Piaget proved wrong again!

http://www.eurekalert.org...j-sgm122105.php

Seems like the grandaddy of developmental psychology over-estimated the competance of everyone over eight years old. At about this age we learn about conservation of volume, in particular that a tall thin glass doesn't necessarily have more in it than a short fat one.. except we often forget when drinks are involved.

Short glasses more likely to lead to over-indulgenceShape of glass and amount of alcohol poured: Comparative study of effect of practice and concentration; BMJ Volume 331 pp 1512-4

make mine a short!