[For Seniors] Lively two-choice trivia quiz. Handy to know and tidbits you'll want to share with others

10-yen coin

Copper, the primary material used in 10-yen coins, has a strong antibacterial effect known as the “oligodynamic effect,” in which copper ions are released upon contact with moisture and break down bacteria. The main cause of unpleasant shoe odors is bacteria that feed on sweat and sebum. By placing 10-yen coins inside your shoes, the copper ions can inhibit the growth of these bacteria and help prevent odors from forming.

To determine height in the event of a bank robbery

Many of the ornamental plants placed in banks are trimmed to a height of about 170 cm. In the event of a robbery, after the perpetrator flees, comparing whether they were taller or shorter than the plant serves as a yardstick to estimate the robber’s height.

No way, it won't increase.

People often say that “pulling out a gray hair will make more grow,” but this is a superstition with no scientific basis. Plucking a hair does not cause the surrounding black hairs to turn gray. If you’re concerned about gray hairs, it’s better to trim them close to the root or dye them rather than pluck them.

to melt

The base ingredients of gum have a property of being “easily dissolved in oil.” Meanwhile, chocolate contains plenty of an oily component called cocoa butter. Therefore, when you chew them together in your mouth, the oil in the chocolate breaks down the gum, causing it to dissolve into a gooey mess and disappear.

spiciness

The five basic human tastes are sweet, sour, salty, bitter, and umami. In fact, spiciness is not a taste; it is conveyed to the brain as pain or heat. When you eat extremely spicy food and your tongue stings or feels hot, it’s because your body is perceiving it as a stimulus.

prosperity

The checkered ichimatsu pattern is a design in which squares of two colors continue endlessly in all directions without interruption. Because of this characteristic, it embodies wishes for everlasting prosperity, such as “prosperity of descendants” and “business expansion.”

dentist

Convenience stores are often thought to be everywhere in every city, but in fact, there are more dental clinics! According to a 2019 survey by the Ministry of Health, Labour and Welfare, there were actually 10,000 more dental clinics than convenience stores. Now that you know that, you might start noticing dental clinics more often from now on.