Jewelers may prize abalone shells for their mother-of-pearl, but scientists have long been equally enchanted by the shell’s strength. Researchers at the University of California, San Diego have used a ...

1. Roll out the modelling clay until it is about 1cm thick and approximately 12cm square. Lightly mark a 10cm square on the clay. 2. Trace a snail shell or the starfish design onto a piece of paper ...