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254 pages, Kindle Edition
First published April 15, 1999
“Finally, the energy/matter connection is the reason behind the observable fact that light speed is the speed limit of the universe. No energy or information can travel faster than light, because as anything begins to approach the speed of light it gains an ever increasing amount of mass. Mass is a measure of inertia, the resistance to a change in motion. So the more speed or motion something has, the harder it is to make it go faster, because it also has become more massive. Eventually, the thing gets infinitely massive, which means that it would take an infinite force to make it go any faster. So even inertia is not absolute: Inertia increases the faster you go.” (page 142, eBook)