Multiple choice general knowledge

The hair of an adult man or woman can stretch -- percent of its length without breaking.

  1. 15

  2. 20

  3. 25

  4. 30
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Human hair is remarkably elastic and can stretch up to 25% of its original length without breaking when wet, and slightly less when dry. This elasticity is due to the keratin protein structure and hydrogen bonds that can stretch and reform. The 25% figure is a well-documented scientific fact.

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