Comedy equals tragedy plus time

When it's OK to joke about 9/11, plus Pete Davidson, a date to be determined, and 7 other things worth your time.

My question today is when it’s OK to laugh.

On 9/11, 343 FDNY firefighters died, and one of them was Scott Davidson, 33, who had been with the department since 1994.

He and the others from Ladder 118 were last seen running up the stairway in the Marriott World Trade Center Hotel, which was right next to the towers.

Davidson had been born in Brooklyn, gr…