14th St NYC Apple Store Is 2nd Biggest In US, First to Offer Free Pro Classes

It may not be the biggest like we suggested—Chicago's Michigan Ave still beats it by a few square feet—but the first three-story Apple Store has a lot going on that others do not:

• Apple's first three-story glass staircase (we were wrong about the elevator)

• 46-foot Genius Bar capable of serving 100 tech-support…