Bought the book, love the book, have a suggestion and so started a new thread.
In Chapter 15 ("Meteors, Meteor, and Meteorites, Oh My!"), on pages 139-140, is a discussion of what could be done about preventing an asteroid from striking the Earth. No mention is made of the first serious and detailed examination of the asteroid interception issue: Project Icarus, conducted by graduate students at MIT in early 1967. This was the report that, when published by MIT Press, gave Hollywood the idea to produce the movie Meteor and all subsequent movies of that ilk. When Worlds Collide lacked the prevention element, which Project Icarus supplied. Bad Astronomy implies that Hollywood came up with the idea of asteroid interception instead.
I wrote a brief article on Project Icarus, with illustrations, for the National Association of Rocketry's Sport Rocketry magazine, and it was published in the March/April 2000 issue (pages 6-11). The grad students were given the task of finding a way to deflect the asteroid Icarus, scheduled to bypass Earth in mid-1968 but here assumed to be on the verge of impact (impact date: June 14, 1968). The multidisciplinary group settled on using a number of Saturn V launch vehicles and 100-megaton H-bombs to solve the problem.
Finding copies of MIT Press's Project Icarus is difficult now, as the last edition was published in 1979 and it has gone out of print, apparently forever. If you can find a copy on e-Bay, get it soon.
If there is interest in this topic, I can reproduce a longer version of my article here. I cannot reproduce the illustrations showing details of the Icarus/Saturn V launch vehicle or the Icarus interceptor spacecraft, as they were done by someone else and are copyrighted by Peter Alway and the National Association of Rocketry. You can get extra copies of the issue, however, from the NAR (do not confuse this with the NRA).
Adding mention of Project Icarus (not my article, but the original MIT work) should be made on pages 139-140 in the book. That's my two pennies.