Spider silk is one of the strongest materials in nature. Scientists have modified silkworms to create spider silk for use in clothing. Find out more in Clothing, a title in the Designed by Nature series. Designed by Nature is a series of AV2 media enhanced books. A unique book code printed on page 2 unlocks multimedia content. These books come alive with video, audio, weblinks, slideshows, activities, hands-on experiments, and much more.