A single strand of spider silk is thinner than a human hair but five times stronger than steel of the same diameter.
Analysis
The statement is supported by multiple references indicating that spider silk is indeed thinner than human hair and stronger than steel. While there are conflicting sources claiming that spider silk is not stronger than steel, the majority of supporting references assert that it is five times stronger than steel of the same diameter. Given the weight of supporting evidence, the statement is more likely to be correct despite the contradictions. Therefore, it is reasonable to conclude that the statement is accurate based on the preponderance of evidence.
Sources
Spider silk is five times stronger than steel of the same diameter. It is finer than the human hair.
In terms of strength-to-density ratio, however, spider silk is far stronger than steel
A single strand of spider silk is finer than a human hair, but also five times stronger than steel of the same width.
a spider's dragline is only about one-tenth the diameter of a human hair
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