I just came across this bit about asteroid Apophis and the chances of it impacting earth . "NASA scientists have recalculated the path of a large asteroid known as Apophis and now say it has only a very slim chance of banging into Earth.. The Apophis asteroid is approximately the size of two-and-a-half football fields, and updated computational techniques and newly available data indicate the probability of an Earth encounter on April 13, 2036 for Apophis has dropped from one-in-45,000 to about four-in-a million, NASA stated." So here's the bit that rubs me wrong: "four-in-a million". Why not say "one-in-250,000". If the authors are really stuck on the whole "four-in" thing then they should have said four-in-180,000 to start with. I really find inconsistencies like this baffling, I wish I knew the author and could understand what they hoped to gain by reporting the number in this way.