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

Keyboard playerSAKI
I’ve been playing the Electone since I was six, mainly performing Disney music, anime songs, and music from dramas and films. I post performance videos on YouTube and social media, and I also give concerts. Building on my Electone experience, I took up synthesizer and piano during my student years and performed at school-sponsored events. As a writer, I’ve covered not only music-related topics but a wide range of genres, so I hope to draw on my experience to deliver articles that make readers think, “I want to try that!” or “I want to listen to that!”
Accompanist / Piano Instructoryuri
Accompanist pianist × piano instructor × web writer. I began piano lessons at age four and, inspired by my piano teacher, decided to pursue music. I went on to specialized music programs in high school and university, where I discovered the appeal of accompanying instrumentalists and singers. Currently, alongside teaching piano, I work mainly in my home region of Aichi as an accompanist for flute, voice, choir, and more. Through lessons, my students often introduce me to trending songs, and my hobby is trying anything on the piano—Japanese and Western pop, commercial jingles, and beyond. Since 2021, I’ve also been active as a web writer, covering music and a variety of other genres.

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?

Surprising Facts Quiz on the World, Animals, and History (1–10)

The shortest war in history ended in one hour.

See the answer

The shortest war in history was the Anglo-Zanzibar War of 1896, which ended in just 40 minutes. Faced with the overwhelming strength of the British forces, the soldiers of Zanzibar fled, bringing the brief conflict to a close.

Raise the rankinglower

yuri

Report a problem

Rodin’s sculpture The Thinker is contemplating his own sin.

See the answer

“The Thinker” is said to represent a judge looking down on those who have fallen into hell from above, and that he isn’t thinking at all—just gazing down at the sinners.

Raise the rankinglower

yuri

Report a problem

All gorillas have blood type B.

See the answer

Gorillas have multiple blood types, such as mountain gorillas which are only type A or O, and western lowland gorillas which are only type B. It seems this rumor spread because the vast majority of gorillas are western lowland gorillas, which are exclusively type B.

Raise the rankinglower

yuri

Report a problem

The capital of Brazil is Brasília.

See the answer

〇

In Brazil, Rio de Janeiro and São Paulo are well known, but the capital is a place called Brasília. Brasília is a planned city newly built inland in 1960 to promote the country’s political and economic development, and it is also registered as a UNESCO World Heritage site. The city’s design is by the famous architect Oscar Niemeyer, and it is characterized by a modern and distinctive urban landscape.

Raise the rankinglower

kappamaki