These items make our lives easier every day, but none of them would exist without their military beginnings.
1. Duct Tape
The miracle tool was invented in 1942 as a way to waterproof ammunition cases. Soldiers fighting World War II quickly realized the tape they used to seal their ammo had a number of other uses.
For better or for worse. And for the record, it was originally known as "duck tape," because the tape was adhesive stuck to waterproof duck cloth. The strength and durability make it the ideal tape for hilarious pranks.
The autoinjector pen used to help fight off allergic reactions has its design roots in U.S. military Nuclear-Biological-Chemical warfare operations. The same technology which injects epinephrine into a bee-sting victim was developed to quickly give a troop a dose of something to counter a chemical nerve agent.
3. Beer Keg Tap
This one is actually kind of backwards. Richard Spikes was an inventor with a number of successful creations by the time he invented the multiple-barreled machine gun in 1940. He invented the weapon using the same principles as his first invention, the beer keg tap.
4. The Bikini
The inspiration for this one is more for the name than the item itself. In the late 1940s, a car engineer name Louis Réard developed a swimsuit he was sure would be the smallest bathing suit in the world. Expecting the spread of his design to be an explosive one, he called the suit the Bikini, after Bikini Atoll, the lonely Pacific Island where the West conducted nuclear weapons tests.
Meaning "Water Displacement, 40th Formula," WD-40 was first developed to keep the very thin "balloon" tank of Atlas Intercontinental Ballistic Missiles from rusting and otherwise corroding. The tanks had to be inflated with nitrogen to keep them from collapsing.
WD-40 remembers its roots: last year the company led a fundraising and awareness campaign, using its can to help fight veteran unemployment through the U.S. Chamber of Commerce's Hire Our Heroes initiative to help find meaningful employment for transitioning veterans.