Ed Felten and his wife Laura are moving to DC, where he is starting a new job: deputy chief technology officer in the White House.

We said farewell to the Feltens on their last Sunday at Princeton United Methodist Church, where Laura has taught Sunday School for forever. The children were asked, “How many of you have had Mrs. Felten for a teacher,” and virtually all raised their hands — as did Ed.

So what did he do for his first week on the job? Post a brain teaser. And invite us to follow his Twitter stream @edfelten44 for hints.

We’ll miss them.