October 23, 2014 14:48 UTC

Science in the News

Two Inventions That Helped Level the Playing Field Against Bullets, Car Crashes

A Volvo in a crash test at the North American International Auto Show in Detroit, Michigan, in January. A Volvo engineer, Nils Bohlin, invented the modern shoulder and lap seatbelt.
A Volvo in a crash test at the North American International Auto Show in Detroit, Michigan, in January. A Volvo engineer, Nils Bohlin, invented the modern shoulder and lap seatbelt.

Or download MP3 (Right-click or option-click and save link)

BOB DOUGHTY: This is SCIENCE IN THE NEWS in VOA Special English. I’m Bob Doughty.

CHRISTOPHER CRUISE: And I’m Christopher Cruise. Today we tell about two recent inventions that have helped to save lives. We will also tell about the people who developed them.

(MUSIC)

BOB DOUGHTY: Most cars have seatbelts as part of their equipment. Seat belts protect drivers and passengers in case of accident. They also reduce the effect of a crash on the body. Safety experts estimate that the restraining devices save more than thirteen thousand lives a year in the United States alone. Worldwide, some experts say the devices have protected up to a million people.

The first seatbelt was said to have been created in the eighteen hundreds by George Cayley of England. He is remembered for many inventions, especially for early flying machines.

The United States first recognized the invention of an automobile seatbelt in eighteen forty-nine. The government gave a patent to Edward J. Claghorn of New York City so that others would not copy his invention. Claghorn called the device a Safety-Belt. It was said to include hooks and other attachments for securing the person to a fixed object.

CHRISTOPHER CRUISE: Other inventors followed with different versions of the seatbelt. But more than one hundred years passed before the current, widely used seatbelt was developed. It resulted from the work of a Swedish engineer, Nils Bohlin. His three-point lap and shoulder seatbelt first appeared on cars in Europe fifty years ago.

Bohlin was born in Sweden in nineteen twenty. After completing college, he designed seats for the Swedish aircraft industry. The seats were built for the pilot to escape from an airplane in case of disaster.

Bohlin’s work with planes showed him what could happen in a crash at high speed. In nineteen fifty-eight, Bohlin brought that knowledge to the Swedish car manufacturer Volvo. He was the company’s first chief safety engineer.

At the time, most safety belts in cars crossed the body over the abdomen. A buckle held the restraints in place. But the position of the buckle often caused severe injuries in bad crashes.

BOB DOUGHTY: Nils Bohlin recognized that both the upper and lower body needed to be held securely in place. His invention contained a cloth strap that was placed across the chest and another strap across the hips. The design joined the straps next to the hip.

Volvo was the first automobile manufacturer to offer the modern seatbelt as a permanent addition to its cars. It also provided use of Nils Bohlin’s design to other carmakers.

The Swedish engineer won many honors for his seat belt. He received a gold medal from the Royal Swedish Academy of Engineering Sciences in nineteen ninety-five. He died in Sweden in two thousand two.

(MUSIC)

CHRISTOPHER CRUISE: Kevlar is another invention that has saved many people from serious injury and death. Kevlar is a fibrous material with qualities that make it able to reject bullets. Added to clothing, the material protects security officers and soldiers across the world.

The fibers form a protective barrier against gunfire. Bullets lose their shape when they strike Kevlar. Those bullets look like mushrooms, and do not enter the body. Most threats to police and security officers come from handguns. They wear Kevlar vests to protect the upper body. Soldiers wear more extensive clothing protected with Kevlar against heavier ammunition.

British Royal Marine Eric Walderman wears the Kevlar helmet that saved him from four bullets during fighting in southern Iraq in March 2003
British Royal Marine Eric Walderman wears the Kevlar helmet that saved him from four bullets during fighting in southern Iraq in March 2003

BOB DOUGHTY: Kevlar might not have been invented had Stephanie Kwolek been able to seek a career in medicine. From childhood, she wanted to be a doctor. But she lacked the money for a medical education.

Today, thousands of people are glad that Stephanie Kwolek became a research chemist. In that job, she developed the first liquid crystal polymer. The polymer was a chemical product that formed the basis for Kevlar.

CHRISTOPHER CRUISE: Stephanie Kwolek was born in nineteen twenty-three in New Kensington, Pennsylvania. As a child, Stephanie loved science. Later, she studied chemistry and other sciences at a Pennsylvania college now known as Carnegie Mellon University.

She got a job with the DuPont chemical company in nineteen forty-six. It was the beginning of a career with the company that lasted about forty years.

BOB DOUGHTY: By the nineteen sixties, DuPont already had produced materials like nylon and Dacron. The company wanted to develop a new fiber. Stephanie Kwolek was part of a DuPont research group that asked to work on its development.

At the time, she was searching for a way to make a material strong enough to use on automobile tires. If tires could be improved, automobiles would need less fuel. Ms. Kwolek needed a new way to make stiff, resistant fibers for the job.

Stephanie Kwolek
Stephanie Kwolek

CHRISTOPHER CRUISE: Her experiments for the project were supposed to produce a clear substance similar to a thick syrup. Instead, what Stephanie Kwolek produced was unexpected. It was a liquid that looked cloudy or milky. She said she might have thrown it out. But she decided to let it sit for awhile.

Last year, she told VOA that she was warned the liquid could never complete a required process. The process calls for the chemical to be pushed through the small holes of a spinneret. She remembers that the man operating the device at first refused to accept her material. He probably suspected it had solid particles that would block the holes. However, after a while he said he would try it. She says she thinks he was tired of being asked, or might have felt sorry for her.

BOB DOUGHTY: That person must have been surprised when the substance passed the test. It returned from the laboratory with more firmness than anything Stephanie Kwolek had made before.

Ms. Kwolek did not tell anyone that she had produced something new and strong. She said she was afraid there might have been a mistake. Repeated testing, however, did not find anything wrong. She and her group worked to improve the discovery.

DuPont first manufactured large amounts of Kevlar in nineteen seventy-one. The material is found today in hundreds of products from sports equipment to window coverings.

Over the years, Stephanie Kwolek has received many awards. Her honors include membership in the National Inventors Hall of Fame. Today she says she loved her long career in chemistry. She says that considering the times, she was lucky to get the job.

(MUSIC)

CHRISTOPHER CRUISE: Getting Kevlar placed in protective clothing resulted mainly from the work of Lester Shubin and Nicholas Montanarelli. Mister Shubin was educated in chemistry. He worked for the United States Army in the nineteen seventies. At the time, Mr. Montanarelli was an Army project director. He was trained in engineering and psychology.

The two Americans were working at the Aberdeen Proving Ground in Maryland. They were searching for a way to protect people in public life from gunfire. Mr. Montanarelli knew about DuPont’s recently developed fiber, and the two men decided to test it.

BOB DOUGHTY: The men fired handguns at several materials protected by Kevlar. The material changed the shape of the bullets. It seemed a good candidate to help defend police officers and soldiers.

Mr. Shubin was able to gain financial help for a field experiment. Thousands of police officers in many cities began to wear the vests. But Mr. Montanarelli said it was difficult to get companies to make them. The companies feared legal action if the vests should fail.

CHRISTOPHER CRUISE: Then came December nineteen seventy-five. A gunman shot at a policeman in Seattle, Washington. One bullet hit the officer’s hand. But a bullet fired very close to the policeman struck his chest.

The officer survived. The bullet did not enter his body. He felt good enough to protest being kept in a hospital that night to make sure all was well. The incident helped get manufacturers to stop worrying about legal action. They began making the vests.

BOB DOUGHTY: Today, about three thousand people are members of the Kevlar Survivors’ Club. DuPont and the International Association of Chiefs of Police organized the group. All the members have escaped injury or death because long ago, a chemist named Stephanie Kwolek produced something unexpected.

(MUSIC)

CHRISTOPHER CRUISE: This SCIENCE IN THE NEWS was written by Jerilyn Watson. Our producer was June Simms. I’m Christopher Cruise.

BOB DOUGHTY: And, I’m Bob Doughty. You can find transcripts, MP3s and podcasts of our programs at voaspecialenglish.com. Join us again next week for more news about science in Special English on the Voice of America.

This forum has been closed.
Comments
     
There are no comments in this forum. Be first and add one

Learn with The News

  • Armed officers approach Parliament Hilll following a shooting incident in Ottawa, Oct. 22, 2014.

    Video Deadly Attack Shocks Canada's Capital

    Also, Kurdish lawmakers in Iraq vote to send Kurdish forces to the Syrian town of Kobani. China said 43 people tested for possible Ebola infection do not have the virus. Russia and Ukraine are still working to reach an agreement on Ukraine's payments for natural Gas. More

  • FBI Director James Comey speaks about the impact of technology on law enforcement, Thursday, Oct. 16, 2014, at Brookings Institution in Washington.

    Audio Apple, FBI Battle Over Privacy Rules

    Apple recently said it was increasing security settings on its latest operating system for the company’s wireless devices. Apple said its new encryption rules are designed to protect users from search and seizure of their iPhones. But the changes are of concern to federal investigators. More

  • Survivors of the Ebola virus pose for a picture outside a clinic near Tubmanburg, October 15, 2014. A total of 4,493 people have died from the world's worst Ebola outbreak on record as of Oct. 12, statistics released by the World Health Organization showe

    Audio Ebola Survivors Speak Out about Their Experience

    The number of Ebola cases continues rising. But there is some hope for those who survive the disease. Recently, a conference for Ebola survivors was held for the first time in eastern Sierra Leone. The goal was to offer advice to survivors and increase understanding of the disease. More

  • Men convicted of drug related crimes hear the public announcement for their death sentences in Shenzhen, China, on August 15, 1996.  (AP Photo/Vincent Yu, File)

    Audio Activists: China Executed 2,400 People in 2013

    The number of executions in China is lower than in earlier years. However, it is more than three times higher than the number of executions in the rest of the world combined. That information comes from Amnesty International. Death penalty numbers are a state secret in China. More

  • Ebola-CDC brief

    Audio  WHO: Ebola Vaccine Could Be in Use by January

    Also, student leaders in Hong Kong not satisfied with first talks with government officials. North Korea has releases one of three American prisoners. And South African Olympian Oscar Pistorius has been sentenced to five years in prison for the deadly shooting of his girlfriend, Reeva Steenkamp. More

Featured Stories

  • Audio Iron Ships Clash at Sea

    The American Civil War was fought not only on land, but at sea. In 1862, Confederate and Union forces fought a new kind of navy battle in waters off Hampton Roads, Virginia. It was the first battle between iron ships. On the Confederate side was a ship called the Virginia. | The Making of a Nation More

  • Audio San Francisco Radio Stations Ban Lorde's 'Royals'

    The California baseball team, San Francisco Giants, is playing the Kansas City Royals for the 2014 Major League Baseball championship, the World Series. Two radio stations in San Francisco banned the hit song "Royals." In return, another station in Kansas City chose to play the song once every hour. More

  • A neurovascular unit on a chip being developed by Vanderbilt University researchers. (Vanderbilt University Photo/John Wikswo)

    Video Scientists Design Chips to Act Like Human Organs

    Testing new drugs for safety and effectiveness is a costly process in the United States. It also can take a lot of time. Some scientists are now designing silicon computer chips that act like human organs. The scientists think they have found a way to make the process faster and more economical. More

  • Brain Resource Infographic

    Audio Dealing with Distractions and Overreactions

    Five million American children and teenagers have Attention Deficit / Hyperactivity Disorder, commonly known as ADHD. ADHD makes it difficult - if not impossible - to stay with a duty until it is complete. Katherine Ellison knows the problem well. | Health Report More

  • Millions of years of history, which can be found on the ocean floor, are collected and analyzed at the Core Repository in New York.

    Video Scientists Create New Maps of Ocean Floor

    Until recently, scientists had mapped only about 20 percent of the sea floor. But our knowledge of the deep seas is changing because of information from satellites. Scientists have produced a new map that provides a detailed picture of the oceans. More

Practice Your Writing

Confessions of an English Learner BlogConfessions of an English Learner Blog

Tell us About Our Programs