Some spiders' silk is five times as strong as steel. Scientists want to harness that strength for more durable cloth, but artificially making long, strong fibers of the spider silk has been a challenge.
Now scientists have figured out how to insert a spider silk protein into silkworms and get raw silk that is 53 percent tougher than the worms' native threads. The new threads were durable enough to be woven and sewn into a scarf and a vest (left). The results appear August 27 in PLOS ONE.