While some said they still weren't comfortable talking about their disabilities, others stood up in smaller sessions and talked about how they would not be attending college because they couldn't sit through a two-hour lecture.

He was nevertheless able to give a two-hour public lecture.

"Don't let Dr. Harkase hear any remarks like that or he will give you his special two-hour lecture on the legal aspects of temporal displacement of scientific knowledge."

"I would never have thought you could have a two-hour lecture on why something so mundane was built," said Ms. Cheever, 44, a pharmaceutical executive from Princeton, N.J.

Ms. Born, 28, a technical writer and 1998 graduate of M.I.T., gave a two-hour lecture on the science of chocolate with pots of melted chocolate chips as props.

On the first Shabbat after liberation, he led the public prayer services in a newly-opened synagogue and delivered a two-hour lecture, quoting from memory scholarly writings that he had last seen years before.

Each two-hour lecture will begin at 7 P.M. Fee, $22 (members, $17).

His two-hour lecture is sponsored by the New York Transit Museum and will be illustrated by maps, photographs and historical documents.

The information was divulged to Chinese nuclear weapons experts during a two-hour lecture in Beijing in May 1997 by Peter Lee, an American scientist, court records show.

In addition to rink time, attendance at a two-hour weekly lecture is compulsory.