What they found is that the substance, which is made up of highly entangled polymers, is both viscous and elastic, both of which are "valuable properties for catching fast-flying, incoming insects--and in keeping the victims trapped long enough for the spider to subdue, and devour, them"
Source:
http://www.care2.com/causes/environment/blog/secrets-of-spider-web-stickiness-revealed/
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