21.  Jenine Sahadi knows this, just as she knows the times.

22.  Knowing the times of day and night when telemarketers strike, I was ready when I answered a call on a Friday evening.

23.  Lehman knows hard times, and though he is financially secure now, he has not forgotten hard work.

24.  Much of the U.S. adult population has never known hard times, and thus can be forgiven for their fears of what a recession might mean for them.

25.  Ms. Scheiber had known tough times as a child in turn-of-the-century Brooklyn.

26.  Since radio waves travel at a known speed through air, knowing the time means knowing the distance.

27.  The only way some assistants knew the time was by tracking the landing of the Concorde at nearby Dulles Airport.

28.  The time is known to geologists as the Cretaceous-Tertiary boundary.

29.  The time is known because an emergency beacon was triggered as it disappeared beneath the waves.

30.  They know me, and they know my times.