Update: The flag on Princeton's grants was removed on June 4, around the same time NSF got this letter from Democrats on the House Science Committee, demanding details. democrats-science.house.gov/imo/media/do...
Dan Garisto
Important update: This morning NSF removed its internal flags on 3 of the 4 universities (Princeton's remains). We've updated our story to reflect this and the release of the new awards to Harvard and Duke.