"Take, for example, the following statement in the brochure Was Life Created? about spider silk being one of the strongest materials on earth: “If enlarged to the size of a football field, a web of dragline silk 0.4 inch thick with strands 1.6 inches apart could stop a jumbo jet in flight!” Although the source for this statement was a reputable science magazine, it was not the original source, and the original source was ambiguous. Therefore, it became necessary to contact the researcher who made the original statement and check how hereached this conclusion. Our researchers also had to find the formula and the information needed to calculate for themselves what impact a jumbo jet might have on a spiderweb the size of a football field. Many hours of research and meticulous calculations eventually confirmed the accuracy of this astounding piece of information."
I don't believe this for a second. I don't remember my engineering textbooks having any formula for calculating the strength of football field sized spider-webs. Presumably they have a couple of chartered engineers hanging around for just such a question?!