Bears do it, bats do it. So do dogs and humans. They all yawn. It's a common behavior, but why is a bit of a mystery. Researchers think yawning may perk up the brain and help with social bonding.
Teachers rallied at the Statehouse in Indianapolis in 2011 to protest Gov. Mitch Daniels' attempts to curb collective bargaining, implement merit pay and create a voucher system that would send taxpayer money to private schools.
Darron Cummings/AP
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Demonstrators march in Moscow on Sunday against the city's controversial plan to knock down Soviet-era apartment blocks and redevelop the old neighborhoods.
Alexander Nemenov/AFP/Getty Images
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