When we buy beverages at a vending machine, we never say "I will insert 100JPY(Japanese Yen) coin". How do vending machines distinguish the kind of bills and coins ? Actually, inside vending machines there are machineries that can distingu…

For example, What is the hamberger made of ? We can answer that is made of bread and hamberg and vegetable. Then, What is the hamberg made of ? That's made of meat, onion, egg, salt, pepper... We can state more details. When we think about…

I'm reading following Encyclopedia, I will make memo of words I didn't understand in Encyclopedia as needed using following dictionary. archive.org dictionary.cambridge.org *stand for it is an abbreviation of a word or phrase: VAT stands f…

What's the difference between creatures born from an egg and others? That depends on the history of evolution that each creatures trailed. Evolution means that the structure of body changes along the change of environment. The first creatu…