Breaking News from CBS

• Oklahoma tornado's strength upgraded to rare EF5

  Damage survey puts twister in strongest class, with winds over 200 mph; search for survivors comes to an end, fire chief says

• Oklahoma tornado: Teachers emerge as heroes

  Teachers credited with saving lives after shielding students with their bodies, directing children to hide under desks

• Power of Okla. tornado surpassed Hiroshima bomb

  National Weather Service upgrades Okla tornado to its top-of-the-scale rating of EF-5, with winds estimated between 200-210 mph

• Bay Area hosting 50th Super Bowl

  NFL owners voted for the 49ers' new stadium in Santa Clara to host football's biggest game in 2016; 2017 game will be in Houston

• Peace Corps will accept same-sex couples

  Organization has allowed married couples to serve together since it was founded in 1961