If you have been to Japan, you will notice one thing: there are so many vending machines where ever you go. It might not be a surprise that Japan has the highest density of vending machines in the world with around 5 million machines nationwide. Approximately, there is 1 vending machine for every 23 people, which brings an annual sales more than $60 billion.
Why Japan has so many vending machines? Read More
Driving anywhere in the world will require you to follow common rules: traffic light, road signs, and speed limits. If we need to follow rules when we drive a car, what are the rules that pilot follow? Read More
Money—an abstract concept—a piece of paper with numbers written on it. It is a quintessential part of life, but yet many are struggle to keep up with it. What are the problems? Read More
When you look down at your keyboard and you will see QWERTY on the first letter row. This keyboard can be found from computer to smartphone. The question is why QWERTY on the first place? Read More
To be healthy we should eat food with variety of colours. But there is one exception, blue colour. Blue coloured food is so rare—and if there is blue food on the plate, I guess it will be unappetizing to eat. How about blueberry? Blueberry is yummy, isn’t it? The thing is blueberry is not actually blue—yes the outside is blue—but the inside is more like purple. In fact, the colour of blueberry is changing depending on the acidity of the environment.
So why does blue is so rare in plants? Read More