I don’t want to get you worried, or even mildly concerned. No need to panic. In fact, just read this little piece, and remark with interest that an asteroid is going to get really really close to the Earth on October 31, 2041. It might - I repeat might - have a small, insignificant chance of hitting the Earth and causing regional devastation. Like a 1 in 40,000 chance. Those are pretty good odds when you think of it. Still not panicking? Good. The asteroid in question is called 2006 XG1. It was discovered on September 20, 2006 by the...