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Practice Listening: Multiple Choice, Multiple Answers
ID: #35426
Short
Hair
Transcript:
All mammals have hair—commonly called fur when it's on your cat or a koala. And the thickness of individual hairs varies from species to species. For example, elephant hairs are more than four times thicker than a strand from an adult human.
“Normally, when the animal is larger, the hair tends to be thicker."
University of California, San Diego, materials scientist Wen Yang. She’s interested in how biological structures like hair hold up under stress. That interest comes from a desire to design better synthetic materials.
Yang’s team tested the tensile strength of hair from eight different mammal species, including humans. They subjected those hairs to increasing levels of tension until the fibers broke. The researchers assumed that thick hair—from giraffes, elephants and boars, for example, would be more robust. But they were wrong.
“Normally, when the animal is larger, the hair tends to be thicker."
University of California, San Diego, materials scientist Wen Yang. She’s interested in how biological structures like hair hold up under stress. That interest comes from a desire to design better synthetic materials.
Yang’s team tested the tensile strength of hair from eight different mammal species, including humans. They subjected those hairs to increasing levels of tension until the fibers broke. The researchers assumed that thick hair—from giraffes, elephants and boars, for example, would be more robust. But they were wrong.
Which of the following statements about hair are correct?
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