Print this off at A4, then cut and fold according to these instructions:
1) Print out this flyer and cut down to an even size
2) Fold along all of the dotted lines so they become creases and smooth paper back out
3) Fold in half length ways and cut between the two central dots, you should have a cut in the middle of the paper
4) Hold by the edges and collapse into a booklet so that the pages are in order
5) Read about Project 42, enjoy!