• Obama to visit Oklahoma on Sunday
• Stocks: Bernanke rally fades
• Official: Man killed by FBI knew Tsarnaevs
• Basements scarce in tornado-prone Okla. city
• Mayor Bloomberg unleashes tirade against taxi boss
• Woods: Garcia's fried chicken jibe 'hurtful'
• Robot exoskeleton suits to make us superhuman
• Urlacher retires after 13 years
• No evidence global warming spawned twister
• IRS official takes the 5th at hearing