Rocket template (download below) or plain paper Scissors (grown-up use only) Sticky tape Felt tip pens or colouring pencils Paper straw From the leftover paper from which you cut out your rocket ...

In a span of 15 seconds, more than 250 rockets must be launched at a horizontal or upward angle. (“It can’t just fall off the straw,” Lanman says.) Should fewer than 250 make it skyward ...