The Cat's Eye Shell

by Kate Forsyth

  Because the shells have a natural cabochon shape, they were easily set into jewellery, and were particularly popular with sea traders and sailors, especially in Britain.

  The Telescope

  Christian Huygens (1629–1695) was a Dutch scientist who developed new methods for grinding and polishing glass telescope lenses about 1654, when he was only twenty-six. With his new, powerful telescopes, he identified Saturn’s rings and in 1655 discovered Titan, the largest moon of Saturn. Huygens also invented the pendulum clock and wrote the first work on the calculus of probability.