1. Ever notice a little hole in the bottom of a padlock?
That little hole is there for a few reasons. The first is that it lets water drain out of the lock if you’re using it outdoors, so it won’t rust in the rain or freeze and break in the winter. The hole can also be used to oil the lock to keep it working well.
2. What about this thick bit found on many cables?
Those little cylinder-shaped lumps are ferrite cores or chokes, and they’re essentially just chunks of magnetic iron oxide that are there to suppress high-frequency electromagnetic interference.
Have you ever heard weird interference when your cell phone goes off too close to a speaker? Well, ferrite cores are there to keep that from happening to your monitors, power supplies, and everything else.
3. Do you even know how utility blades work?
Take a close look at the blade on your box cutter or utility knife. Notice the little score lines? You can break off the end of the blade to give yourself a fresh, sharp blade whenever you want.
To do so, take that back cap off, slide the blade out the back end, and use the cap to snap off the end of the blade before putting it all back together again.
4. Ever notice the little hole at the end of a tape measure? Ever wonder what it’s for?
It’s there to hook onto nails or screws so you can measure safely without the tape measure slipping.
5. And what about the little serrated edge?
Pretty obvious now that you see it, isn’t it? Imagine trying to mark where your measurement is, but not being able to because your hands are currently both busy using a tape measure.
A little serrated edge would come in handy right then, wouldn’t it?
6. And the little bumps on the “F” and “J” keys on a keyboard?
Most trained typists will already know what they’re there for. In 10-finger typing, the “F” and “J” keys are the home keys, where your index fingers rest. The little bumps let you find your way back to the home position without looking down at your keyboard.
7. What about the hole found in rulers?
Easy. It’s for hanging them up.
8. Why does an Apple power cable have wings?
The wings flip up to give you something to wrap the cable around. Start by wrapping the thicker section of cable around the power block, then the thinner part of the cable around the wings, and secure the whole thing with the little clamp on the very end.
9. And while we’re at it, what’s the dot next to the camera on an iPhone for?
It’s a microphone for when you’re using the back camera.
10. What’s that arrow next to your gas gauge there for?
Maybe you’ve never even noticed it before, but that little arrow is secretly the most convenient feature on any car. It indicates which side of the car the gas cap is on. Believe me, it comes in handy when you’re driving a rental car.