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Many cabbies are also worried about discrimination. Like a lot of drivers from the Middle East and South Asia, Ashok Kumar, an Indian, displays an American flag prominently on his antenna. Still, he says, riders are suspicious. "A lot of people are asking me many questions about myself. Like where am I from, and how long have I been in this country? They're nervous, I understand. I just try to be very nice." It's up to us to be nice back. —DAVID AMSDEN

1. Robert P. Franks, National Center for Children Exposed to Violence:
"Give yourself a break from the news. And if you are a parent, remember that your children take their cues on how to behave and react from you. Show them that in the aftermath of tragedy, you have the courage to live your life."

2. John Draper, Mental Health Association of New York City:
"Because of the enormity of the event, you may think you have no coping mechanisms that can work in this situation. But you should return to ones you've relied on before — and maybe just use them a little more intensely, whether that's exercising, spending time with family and friends, or just listening to more music."

3. Thomas C. Neylan, medical director of the Post-Traumatic-Stress Disorder program at the University of California-San Francisco:
"Sleep. The best way you can be supportive to your loved ones is to be alert and attentive."