about telling the time, i haven't taught her that at home, but they are learning it in school and she's pretty good at telling the time now. Hi my son could tell the time quite early on, he's very academically bright, so could tell time at 4 years, he could tie his tie at 5/6 years, and tie laces at 8 1/2.
These 10 facts about space will blow your mind. External combustion is a process in which a device, such as a motor or engine, is powered by fuel burned outside of the device. It is an alternative to traditional combustion engines, where fuel is burned within the engine itself.
Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer. The fuel can be a solid, liquid, or gas, although for airplane propulsion the fuel is usually a liquid.