It's been eighteen years since the attack on the World Trade Center in New York City. A commercial jet was flown into each of the Twin Towers, igniting about 10,000 gallons of jet fuel.
"Jet fuel burns at 800 to 1,500 degrees Fahrenheit. This temperature is not hot enough to melt structural steel. But engineers say that for the World Trade Center towers to collapse, its steel frames didn't need to melt—they just had to lose some of their structural strength from the intense heat."
The north tower collapsed an hour and 43 minutes after the strike, and the south tower collapsed in 56 minutes.
First responders ran into the danger while those inside ran out. Listen to first-hand memories of fire fighters who survived:
(cont'd tomorrow)
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