A three-choice quiz of useful trivia: a collection of questions you can use in everyday life

Cloudy day

When you clean windows on a sunny day, the strong sunlight hits the glass, causing the cleaner to dry quickly and making water spots and other residue more likely to remain. Cleaning on a rainy day isn’t effective either, since dirt can reattach due to the rain. On a cloudy day, there’s no direct sunlight, and the cleaner dries at a moderate pace, making it easier to achieve a streak-free finish. Therefore, cloudy days are the most suitable for cleaning windows.

Warm the nape of your neck

To make it easier to hit high notes at karaoke, it’s important to relax the throat and vocal cords and keep them in optimal condition. Warming and relaxing the muscles around the throat and vocal cords is effective for this. By warming the neck area, you can improve blood circulation and help the vocal cords move smoothly. On the other hand, coffee and ice cream can irritate the throat due to caffeine and cold temperatures, potentially causing inflammation or stiffening the vocal cords, so it’s best to avoid them when aiming for higher notes.

When an unexpected light stimulus is applied to a certain area

Humans feel ticklishness when unexpected, light stimuli are applied to autistic sensory zones (body areas that are especially ticklish, such as the armpits or the soles of the feet). When you apply the same stimulus to yourself, you don’t feel as ticklish. This is because the brain cancels out predictable sensory input resulting from one’s own movements. Conversely, sudden changes in temperature are not directly related to ticklishness, but they can be interpreted as part of biological defense responses or sensory processing.

bread crusts

The crust of sliced bread can serve as a substitute for an eraser. The bread’s soft texture can absorb pencil graphite, allowing you to erase writing on paper without damaging it. It is said that in ancient times, rolled pieces of bread were used as erasers. However, because crumbs or small debris may remain, and considering convenience and hygiene, this is not a common method today. Still, it may be useful as an emergency substitute.

daikon

The enzymes in daikon can break down stains and effectively remove soy sauce stains from shirts. Grate the daikon, apply its juice to the stain, let it sit for a while, and then rinse it off.

Nihonbashi

On road signs in Japan, the distance indicated as “XX km to Tokyo” is calculated from Nihonbashi. This stems from its historical role in the Edo period as the starting point of the Five Highways, and it still serves as the origin point for Japan’s roads today. Therefore, Nihonbashi—rather than any other location—is the reference point for those distance displays, making Nihonbashi the correct answer.

28 degrees

Commercial chocolate generally begins to melt at around 28°C. It depends on the type of chocolate, but at 24°C it often still remains solid, so it starts to melt at a temperature slightly higher than that.