Brent Boller / Texas Public Radio

Hundreds of first responders gathered at the Tower of the Americas Monday to remember comrades killed in the Sept. 11 terror attacks, which took place 16 years ago.

"Never forget" became a national rallying cry after the attacks of Sept. 11, 2001.

Yet America's schools — where collective memory is shaped — are now full of students who never knew because they weren't alive then. Many teachers now struggle with whether and how to teach the attacks and their aftermath.

According to one survey, only about 20 states include anything in depth about the events of that fateful day in their high school social studies curriculum.

And when they are taught, critics say, it's often through a narrow lens.

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 Miracle Mattress in San Antonio has closed its doors indefinitely after a commercial they posted on Facebook went viral. The commercial’s gotten a lot of attention, and not the good kind.

The commercial promotes a Twin Tower sale for all mattresses being sold for the price of twins. Two men fall backward, yelling, into two tall piles of twin mattresses, and a woman screams and says, “We’ll never forget.”

Danny Nolan was the first man to swing a wrecking ball in Manhattan in 25 years. Wrecking balls hadn't been allowed on the island for a very simple reason: The buildings are much too close together to allow a huge ball to swing back and forth.

An exception was made for Nolan because he, and the other construction workers of the International Union of Operating Engineers Local 14, were "working the pile" — hauling away what was left in the World Trade Center towers after the Sept. 11 attacks.