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True-or-false quiz for adults: a full roundup from common-sense questions to surprising trivia!

Did you know that hidden within the things we take for granted in our daily lives—things we casually use without a second thought—are actually some astonishing facts? From the unit used for a computer mouse, to the origin of SOS, to the history behind the tally mark “正” used for counting, everyday items are full of surprising truths.

We’ll introduce adult-friendly life trivia lurking in the everyday, presented in a true-or-false quiz format.

We’ve gathered questions that will make you think, “Wait, really?” as well as trivia you’ll be proud to brag about.

So, how many can you get right?

Food and Cooking Trivia Quiz (11–20)

The difference between regular, deluxe, and premium eel lies in the quality of the eel.

The difference between regular, deluxe, and premium eel lies in the quality of the eel.
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Many restaurants that serve unajū or unadon offer sizes like “regular,” “premium,” and “extra premium,” but these do not indicate differences in the quality of the eel itself. The distinction is based on the amount of eel and rice. The extra premium typically includes nearly a whole eel.

Salmon is a red-fleshed fish.

Salmon is a red-fleshed fish.
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Because salmon flesh has a reddish color, it may look like a red-fleshed fish at first glance, but it is actually a white-fleshed fish. Its flesh appears red due to a natural red pigment called astaxanthin. By the way, fish are classified as red- or white-fleshed based on the amount of pigment proteins they contain.

Kagawa Prefecture is called the “Udon Prefecture.”

Kagawa Prefecture is called the “Udon Prefecture.”
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Kagawa Prefecture, famous for Sanuki udon, has called itself the “Udon Prefecture” since 2011 to further promote the region. In addition, July 2 has been designated “Udon Day” by the Kagawa Authentic Sanuki Udon Cooperative. Kagawa has a very high number of udon shops and a high level of udon consumption, making it truly worthy of the name “Udon Prefecture.”

The “Pon” in Pon Juice comes from the “Pon” in “Nippon-ichi” (number one in Japan).

The “Pon” in Pon Juice comes from the “Pon” in “Nippon-ichi” (number one in Japan).
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The “Pon” in Pon Juice, a fruit juice produced in Ehime Prefecture, comes from the “pon” in “Nippon-ichi” (number one in Japan). It reflects the wish for the juice to become the best in Japan. By the way, when written in Roman letters, it’s spelled “POM,” not “PON.”

Speaking of Meguro’s specialty, it’s mackerel.

Speaking of Meguro’s specialty, it’s mackerel.
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Meguro’s local specialty is Pacific saury. This originates from the Edo-period rakugo story “Meguro no Sanma,” and every autumn the “Meguro Sanma Festival” is held. At this festival, large quantities of saury are served free of charge, attracting many visitors as a hallmark of the autumn season.