Spiders are one of nature’s first true engineers. They make the toughest casters you can find on our planet. The silk spiders use to build webs is stronger than steel. Scientists believe that if we could make dragline silk, for instance, as thick as a pencil and 18.6 miles long, we’d have material so strong we could stop a jetliner in the middle of the flight. Let’s see what other natural materials are so strong it’s hard to believe they are real.
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