The Royal Institution are advertising for inventors. It looks fun. The advert is at http://www.rigb.org/contentControl?action=displayContent&id=00000005813.
James (age 2) was fascinated by the demo, and wanted to try it out. With some help he was able to assemble the straws and with no help he was able to make them spin. The shot below was taken using a strobe which gave 4 flashes.