You can actually use it to launch a paper plane. We were joined on Blue Peter ... make our brilliant greetings card Place your sheet of A4 card lengthways in front of you. Use your ruler to ...

Use our easy to follow tutorial on how to make this paper plane with just an A4 piece of paper and a few simple folds. Are you ready for a bigger challenge? Here's our trickiest paper plane ...

Chinese scientists have recently achieved the fabrication of single-atom-layer metals with a thickness of merely one-millionth the thickness of an A4 paper sheet, setting a new record for the thinnest ...