The BBC's Paul Reynolds in Washington says the move is a break from the total opposition Mr Bush expressed during the election campaign, but is the most restricted one he could probably have taken given his pro-life position.
The manner of Rossi's triumph was only overshadowed by the way he risked life and limb to usurp his young team-mate for pole position on Saturday on a saturated ice rink of a circuit that had already caused nine crashes.
The Democrats prospered in 2006 in part by softening their position on the culture wars (they backed a pro-life senatorial candidate in Pennsylvania and all but gave up on gun control).
The Libyans were also infuriated by the U.S. government's position, that al-Megrahi should not be released and should finish his life sentence in jail in Scotland.
Neuroplasticity has replaced the formerly-held position that the brain is a physiologically static organ, and explores how the brain changes throughout life.