It may well be the most potent force in the universe. The Greeks were scared to death of it. Aristotle wouldn't permit it (and the Catholic Church's vice-grip on Aristotelianism held Western science and mathematics back for centuries). But this force does not discriminate; it delights in tripping up secular science as well. Certain forms of mathematics must ignore it in order to work. String theory basically pretends it isn't there. It is, as stated on the book jacket, a timebomb ticking in the heart of astrophysics.Zero.