After a decade of successfully tackling the wide-ranging collection of football queries proposed by its readers, guardian.co.uk's dedicated battalion of sleuths continues to uncover the answers in the weekly online column "The Knowledge". Trawling through the archives of nerdvana, this compilation uncovers the truth behind such questions as: Has a referee ever been sent off? Which players have attacked their own fans? Did pigs once force a match to be abandoned? Is Paolo Maldini the greatest runner-up? What is the fastest ever sending-off? Who are the most benevolent players? How did Alan Hansen get his scar? And which is the world's greenest club? All of these posers and many, many more are answered in this second collection of the best and most bizarre questions and answers from "The Knowledge".