in one of the chapters that i wrote, i focused on lewis howard let them are. in checking out what different inventors did in the 19th century, it really made me aware of the fact that there were a lot of black inventors that people didn't know anything about. so i got this idea from that experience. i figured i would do a book on inventors related to children, because there are so many children who are not aware of these things. >> today's children seem to be interested in gaming and videos. why the vehicle of a book to get interested in the story you want to tell? >> i think that a book has the ability to reach children on different levels than games do. it is a lot more in-depth, and a random-access. they can go to any part of it, physically, and draw out the information. >> there are pages of the biography about the inventors. i am sure that you spend time with your coauthors to decide who would be in the book. how did people make the cut? >> our choices had to do with the fact that we wanted to pick people who did things that were very important to everyda