[lizma]

Did he try reversing it, doing the sugar-loaded trial first?

Yep, half the sample size. Same results. I'll run your other suggestions by my son in case he wants to redo it for this years fair. Thanks.

[Gondring]

Great! :-)
Please keep in touch...I'd love to hear what he comes up with, whether it's a memory/processing comparison (beware, might get into some P.C. trouble with the cognition test) or something else.