So what's the "Mark One Eyeball" I refer to in the title?
This term is actual British military slang for eyes or eye sight, derived from British Royal Navy nomenclature for distinguishing sequential variations of a piece of equipment (i.e., "Mark 13 Depth Charge"). Since the human eye has not changed, it is called the Mark I Eyeball. The term is typically used when someone relies too much on their equipment: "Use your Mark One Eyeball!". It is used likewise in the United States military and other predominantly English-speaking countries.The point I'm making is that the "Mark One Eyeball" used with our "Mark One Brains" (no better versions available currently) is a valuable tool for spotting trends in graphical data, and to a lesser extent in tabular data. The eye/brain combination seeks to identify shapes and lines in collections of dots, blobs or points on a graph. The MOE is also good at spotting conflicting scientific or statistical claims, sometimes made by the same person. In December 2009 Dr. Vicky Pope, who is head of the climate predictions programme at the Hadley Centre of the UK Met Office, was (apparently) quoted in a BBC report "figures indicate that the years since 2000 - the "noughties" - were on average about 0.18C (0.32F) warmer than years in the 1990s; and that since the 1970s, each decade has seen an increase of about the same scale". MOE was telling anyone who cared to look at ANY temperature dataset that this couldn't possibly be true. This is the Hadley Centre's own data for 1991-2009: