Stephanie Kwolek liked to design clothes as a girl. It wasn't until high school that she became interested in science.
Stephanie graduated from college and took a job as a chemist. Her job was designing new kinds of textiles. One day, while working in her lab, she noticed something strange in one of her experiments - a mixture that should have been clear and goopy was cloudy and runny instead.
Rather than throwing her experiment away, Stephanie asked her coworkers to test the new substance she'd created. It turned out to be amazingly strong and was eventually used to make a product called Kevlar.
Today, Kevlar is used to make things like bullet-resistant vests, lumberjacks' suits, helmets, fire hoses, and lots of other equipment to keep people safe and prevent injuries.