This has been a difficult chapter. Dr. Randall just isn't being clear, to the point where I don't see the numbers adding up -- meters get expanded to millimeters, and seconds to milliseconds.
I don't know if she is trying to tell us something very subtle that I am just missing (or something obvious that I am missing), or whether an earlier draft of this chapter was based on one set of numbers, and then it was partially updated as the science changed.
