The Guardian – Alex Bellos
“Legs eleven, Ocean’s Eleven, elevenses! Yes, let’s hear it for the number 11, star protagonist of today’s puzzles. Eleven is the first number you reach once you go beyond ten. Since ten is the base of our number system, eleven’s position gives it some interesting properties – as the members of Spinal Tap knew all too well. (Although you might need to turn up your brains to 11 and a half for today’s puzzles.)” (more)