About This Collection
Episodes In This Collection
Nova: Manhunt - Boston Bombers
Given hundreds of hours of surveillance and bystander videos, how did agents spot the bad guys in a sea of spectators? Why couldn't facial recognition software I.D. the criminals? How much could bomb chemistry analysis, cell phone GPS, infrared imagery and crowd sourcing reveal about the secrets behind this horrific crime?
Nova: Oklahoma's Deadliest Tornadoes
Why was 2011--the worst ever recorded tornado season that left 158 dead in Joplin, Missouri--followed by the quietest ever year of activity prior to the Moore disaster? Can improved radar and warning technology explain why so many fewer died in Moore than in Joplin? And will tornadoes get worse as Earth's climate heats up?