Notice anything irritating? If you are a champion of the Apostophe Protection Society (there is one), the absence of a squiggle above this note will be no laughing matter. Any shop sporting the sign "Open Friday's" needs a rock through its window, says Lynne Truss (page 8). Grammar is now back in fashion but in the 1960s there was a vision of a "benign post-literate place in which the ability to construct a sentence would be faintly remembered as an ancient technique akin to fashioning arrowheads out of bits of flint". As it happens, flint is also on the menu this week - cutting-edge stuff (page 14).