One of the primary issues at the heart of the the Chicago teachers' strike is whether student test scores should be used to evaluate teachers and determine their pay. Mayor Rahm Emanuel is pushing that approach, as are other officials around the nation.
But many teachers insist that it's inherently unfair to grade their teaching based on their students' learning.
Over the years, ZZ Top has stayed contemporary: dabbling in new wave, flirting with grunge and techno, making goofy music videos, even using a drum machine. But the band has never strayed too far from its classic amalgam of electric blues, garage rock and greasy grooves. On their new album, La Futura, the members sound like their old selves.