雑学！！

When they were first released in the Meiji era, they were stick-shaped. However, people complained that the smoke didn't last long, and there were also issues with people mistaking them for incense for Buddhist altars. The founder's wife saw a snake coiled up in her garden and came up with the idea for the long-burning spiral shape.

The contents of both are basically the same carbonated drink. What's in a marble-stoppered bottle (Ramune bottle) is called Ramune, and what's in a regular bottle with a crown cap or screw cap is called Cider.

Popular flavors like strawberry, melon, and blue Hawaii actually all use the same syrup. They trick your brain into thinking it's a different flavor by just changing the coloring and flavoring (scent). (Excluding premium syrups with actual fruit juice, etc.)

Manhole covers on streets are almost always 'round' no matter where you go in the world. This isn't a design choice, but a mathematical safety measure. Square or triangular covers pose a risk of 'falling into the hole' if tilted diagonally due to the relationship between the diagonal lengths of the frame. However, circles have the significant advantage that their diameter is the same no matter where you measure, meaning they can never fall into the opening, regardless of rotation.

To allow differentiation even with eyes closed in the bath, many shampoo bottles have ridged grooves on their sides. This is a unique Japanese idea born from the feedback of visually impaired students who close their eyes while washing their hair. In contrast, conditioner and rinse bottles are left smooth, designed to be identifiable by touch alone.

I'll share a lot of trivia today too~

The pilling that forms on your favorite sweater is caused by 'friction' when you wear it. It happens when the tips of the fibers rub against each other, tangle, and ball up. Actually, this is also a natural cushioning phenomenon for clothes, where the pills absorb the friction damage, preventing the fabric itself from tearing or thinning.

You know that little pocket inside the big right pocket of jeans? It's called a "watch pocket," and it's a remnant from the late 19th century when people working in places like coal mines needed a way to store their "pocket watches" without damaging them.

It's the plastic buckle that seals the opening of a bread bag. Its official name is 'bag closure'. In Japan, it's actually manufactured by only one company, 'Quick Lock Japan', located in Saitama Prefecture.