DES MOINES, Iowa (AP) - They're smart people, but some university officials say they can't figure out who is donating millions of dollars to them. During the past few weeks, at least nine universities have received gifts totaling more than $45 million. And the schools had to promise not to try to find out the giver's identity. The gifts ranged from $8 million at Purdue to $1.5 million donated to the University of North Carolina at Asheville.