Coin Ridges
How come quarters and dimes have rough edges, unlike pennies and nickels? Back in the day, they used to stamp coins to reflect their actual value. In the past, people used to make new coins by shaving the coin edges and melting them. The ridges were added as an extra measure against this practice.
Grocery Cart Loops
When you are grocery shopping, you simply want to get everything you need and go. Not a lot of people know that there are loops that frame that fold-out section. Using these loops, it is possible to keep the more vulnerable items safe as you get everything you need. What a great design, huh?