Kwolek

[ kwŏlĕk′ ]
Stephanie Born 1923

American chemist who pioneered the use of polymers to make synthetic fibers. She developed the first liquid crystal polymer fiber, now used to make many products, including bulletproof vests.

QUIZZES

ELEMENTARY SCHOOL PUNCTUATION QUIZ

Punctuation marks help make writing easy to read and understand. Some of the most important ones are the period (.), comma (,), question mark (?), and exclamation point (!). How well do you know how to use them? Find out in this quiz!
Question 1 of 10
Which punctuation mark is best for this sentence? "Can I watch a movie __"
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.