letter

Dr. Tyson wished NASA a happy 50th birthday.

An open letter to the United States Congress on Near Earth Objects.

Follow-up correspondence to family and friends giving an update on the family's psychological state and the living conditions in Lower Manhattan.

First-hand account of the WTC attacks and subsequent evacuation from Lower Manhattan residence. A heavily forwarded e-mail that became the subject of an article in the Wall Street Journal a week later on the widespread use of the web to communicate the tragic news of the day.