A Day in Space: 05/20/08
A Day in Space by Suzanne Lord and Jolie Epstein is a perfect follow up to William Pogue's How Do You Go to the Bathroom in Space? Written a year after Pogue's edition, it covers many of the same topics about life in space but from the point of view of living and working on a space shuttle. Of course with the shuttle about to be shelved, both books are now becoming a bit obsolete.
Lord and Epstein's book is also written as a series of questions and answers but aimed at younger readers (4-8 instead of 9-12). At only 32 pages long, it is much shorter than Pogue's more comprehensive volume.
Of the two books, I preferred A Day in Space as a casual read with my children. The emphasis is on the fun and bizarre details of life in space (like how marbles bunch up and the among of time it takes flies to get accustomed to weightlessness). For actual research, Pogue's longer book is better. If you have children interested in space travel, I recommend having a copy of each.