[Suicide Junkie]

Capnq:
If by that you mean:
"Trade you level 2 AND 3 in physics for levels 2 through 5 in DUC tech"
Then, you'd have to offer two copies of "physics" for four copies of "Projectile weapons"

EDIT: make that four copies, since you start with level 1 in Projectile weapons.

[ 27 February 2002: Message edited by: Suicide Junkie ]