Interestingly, that idea of invention all the known kevlar body armor belongs also to the woman, scientific from a company DuPont, to the American chemist of the Polish origin Stephanie Kuolik.

She created kevlar (synthetic material, which five times stronger, than steel), fibre from which now in the whole world do bulletproof waistcoats. Since 1991, kevlar helmets carry on a head all American soldiers. And the inventor of body armour is plugged in the list of great women of America.

At once a few inventions appeared due to other great American to Sara Meter. One of most important and useful is a spyglass. A periscope for submarine boats (with his help determine distance to the looked after objects) was patented by Sara in 1845.