The Quran Verse
Surah 29:41:
The example of those who take allies other than Allah is like that of the spider who takes a home. And indeed, the flimsiest of homes is the home of the spider, if they only knew.
This is often cited as a "scientific miracle" because female spiders sometimes eat their mates (a "hostile" home).
However, the verse explicitly refers to the structural strength of the house (awhana al-buyut), calling it the "weakest."
Spider silk is one of the strongest materials in the natural world, with a tensile strength comparable to high-grade steel. While a single strand is thin, the "house" is a masterpiece of engineering.
Critics argue the Quran is using a common, observable "layman’s metaphor" (that webs are easy to sweep away) rather than showing a divine understanding of the material’s actual properties.