Everyday objects often feel simple, yet many have surprisingly rich and unusual histories dating back centuries. From the fork to the toothbrush.

Objects With Unexpected Origins

1. The humble paperclip was not patented until 1899 by William Middlebrook, but the design we use today -- the Gem-style clip -- was never patented. It was simply produced and became the standard through ubiquity.

2. Post-it Notes were invented in 1968 by Spencer Silver, a 3M scientist attempting to create a super-strong adhesive. Instead, he created a weak, pressure-sensitive adhesive that could be reused. It took 12 years for the product to launch.

3. The modern toothbrush was invented in 1498 in China, using bristles from hog's hair attached to a bone or bamboo handle. It wasn't until 1938 that nylon bristles replaced natural ones.

4. Safety pins were invented in 1849 by American mechanic Walter Hunt, who twisted a piece of wire while fiddling with it and realized he had created a useful fastener. He sold the patent for just .

5. Bubble wrap was originally invented in 1957 as 3D wallpaper. When that failed, it was remarketed as greenhouse insulation before its potential as packing material was finally recognized.

Accidental Inventions

6. The microwave oven was invented in 1945 when Percy Spencer, an engineer working on radar technology, noticed a chocolate bar in his pocket had melted while standing near a magnetron. He then successfully popped corn kernels with the same device.

7. Silly Putty was the result of wartime efforts to create a synthetic rubber substitute for World War II. When the resulting bouncy, stretchy substance proved useless for tires, it was shelved for years before becoming a toy sensation.

8. The slinky was invented in 1943 when naval engineer Richard James knocked a tension spring off a shelf and watched it 'walk' across the floor in a series of arcs. He spent two years perfecting the steel gauge and coil count.

9. The pacemaker was invented accidentally. Engineer Wilson Greatbatch reached into a box of resistors and grabbed the wrong one while building a heart rhythm recorder. The circuit pulsed instead of recording, mimicking a human heartbeat.

10. Corn flakes were created in 1894 by John Harvey Kellogg as a health food for sanitarium patients. The flaking process was discovered when boiled wheat was left out and rolled into thin sheets by accident.

Design and Evolution

11. The QWERTY keyboard layout was designed in 1873 to prevent typewriter jams, not for speed. The common letters were spread apart so that mechanical arms wouldn't collide. Alternative layouts like Dvorak are faster but never overtook QWERTY.

12. The shopping cart was invented in 1937 by Sylvan Goldman, a grocery store owner who noticed customers stopped buying when their hand baskets got too heavy. He hired a mechanic to attach baskets to folding chairs.

13. Velcro was inspired by burrs that stuck to George de Mestral's dog's fur during a walk in 1941. When he examined them under a microscope, he saw tiny hooks that caught in loops of fabric or fur, and spent years recreating the mechanism.

Hidden Details

14. The standard pencil can draw a line about 56 kilometers (35 miles) long and can write approximately 45,000 words. The 'lead' is actually graphite mixed with clay, and the hardness is determined by the clay-to-graphite ratio.

15. The red solo cup has a precise engineering design. The ridges on the cup serve dual purposes: the lower ridge provides structural strength, while the upper ridge indicates the standard 1-ounce shot line for measuring alcohol.