Toughest Material in Nature

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On the biological side, spider silk is notorious as the toughest. With a higher strength-to-weight ratio than most conventional materials like aluminum or steel, it's also remarkable for how thin and sticky it is. Of all the spiders in the world, Darwin's bark spiders have the toughest: ten times stronger than kevlar. It's so thin and light that approximately a pound (454 grams) of Darwin's bark spider silk would compose a strand long enough to trace out the circumference of the entire planet.

The web of the Darwin's bark spider is the largest orb-type web produced by any spider on Earth, and... [+] the silk of the Darwin's bark spider is the strongest of any type of spider silk. The longest single strand is measured at 82 feet; a strand that circled the entire Earth would weigh a mere 1 pound.

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