[Xose Pérez] set out to make a sundial wristwatch by combining a magnetometer a small nylon bolt for the gnomon, but it doesn’t work like you’d think. Instead of using the magnetometer to ...

Visit BBC Webwise for full instructions This sundial can also be used as a bird feeding table. Select your branch and cut to size with a saw. The same goes for the slice of tree trunk (Toby used ...