Zero 0 is an EVEN number which lies between -1 and 1 This was stated on QI but sorry unable to give a more exact reference But Google gives up the following Wiki Why zero is even The standard definition of "even number" can be used to directly prove that zero is even. A number is called "even" if it is an integer multiple of 2. As an example, the reason that 10 is even is that it equals 5 × 2. In the same way, zero is an integer multiple of 2, namely 0 × 2, so zero is even Please Register or Log in to view the hidden image! https://en.m.wikipedia.org/wiki/Parity_of_zero Unless my eyes deceive me (or my glasses - I'm due a new pair in 2 months) I detect a 0 between -1 and 1 in the line image from the referenced article Hope this helps all Please Register or Log in to view the hidden image!