Let's just say, if there is a lot of spare capacity out there, it is hiding itself well.

BBC: Mr Cameron, GDP and the hole in the recovery

The deluge may test the capacity of law enforcement to catalog and analyze so much material, but crucial clues are likely hiding in the digital files of marathon-goers who were unfortunate enough to be near Monday's explosions.

WSJ: William Bratton: A Cop's-Eye View of Terrorism