[For Seniors] Surprising Facts! Multiple-Choice Trivia Quiz (4 Options)

50km

It’s said that the length of line you can draw before an HB pencil is used up is about 50 km. While this figure assumes certain conditions and isn’t exactly realistic, it’s still far longer than with other writing instruments, making HB pencils arguably very economical.

convenience store

As of 2022, there were 55,956 convenience stores nationwide, compared to 67,886 dental clinics. It’s striking to realize that there are more dentists than convenience stores, which you see everywhere.

3 yen

The 1-yen coin is made of aluminum. The raw material cost per coin is about 0.3 yen, but when you add processing and other expenses, it comes to 3 yen. By the way, it reportedly costs 10 yen to make a 5-yen coin, 13 yen for a 10-yen coin, and finally drops to 12 yen for a 50-yen coin, so try remembering these together.

12cm

It’s said that hair grows about 0.3–0.4 mm per day, which averages out to roughly 2.5 mm per week, about 1 cm per month, and about 12 cm per year. Since there are around 100,000 hairs on the head and about 90% are in the growth phase, adding up their growth is said to total roughly 100 km in a year. You can see that hair has particularly active metabolism compared to other parts of the body.

strong wind

It’s well known as a phrase that lists scary things in order: “earthquakes, lightning, fires, and dad.” In the past, “dad” actually referred to wind-related disasters like typhoons and strong gales. There’s a theory that this was likened to the capriciousness or quick temper of the head of the household, and in modern times it came to mean a frightening figure within the family.

lazy person

“Loafer” is written as “loafer” in English and refers to a lazy person or someone who idles about. It’s said that the name comes from the shoe’s characteristic of being easy to slip on without laces. Despite that origin, loafers were reportedly used as room shoes by members of the British royal family and the aristocracy in the 1920s.

Type A

Among Japanese blood types, type A is the most common, accounting for about 40% of the total. Following that, type O is about 30%, type B about 20%, and type AB about 10%. Where does your blood type rank?