Binghamton University, in New York State, became the latest institution to reveal a multimillion-dollar gift from the mystery donor who has now contributed more than $60-million to a dozen schools in recent weeks, reports the Associated Press.

The one private and 11 public colleges, ranging widely in size and geographic location, appear so far to have only one thing in common: All are led by women. Internet discussion groups are rife with speculation on the donations, which are handled through intermediaries and come with the stipulation that recipients not investigate the source of the funds.