access abyss (global health n.): The gigantic difference in access to pain relief across the world: most of the world's opiates are consumed by the richest fraction of the population. Hundreds of millions die without any pain relief at all. A complete travesty, especially given how cheap they are. Intensification of "gap", the usual economics word for disparity. fictitious force (physics n.): A force which only arises when considering motion between a non-inertial frame and an inertial one. (e.g. the Earth's frame and the Sun's.) We say the sun goes round the earth, despite the licence to say either given by Galilean relativity, because saying the opposite produces four extra awkward forces in the equations. The argument goes through, ultimately, by Occam's razor, and by computational convenience. co-rumination (psychology n.): excessive discussion of one's problems and picking of scabs within friendships. Can make negativity reinfor...