The heart receives its own supply of blood from a network of arteries, called the coronary arteries. Two major coronary arteries branch off from the aorta near the point where the aorta and the left ventricle meet:
Walton, Ernest Thomas Sinton - Student Encyclopedia (Ages 11 and up) (1903-95), Irish physicist. Born in County Waterford, Ireland, Walton, with Sir John D. Cockcroft, received the 1951 Nobel prize in physics for the development of the first nuclear-particle accelerator.
The particle theory of matter was discovered in ancient Greece, when philosophers in 6th century BC held a big conference to the existence of fundamental particles of matter in nature.In 19th century, scientist named John Dalton proposed a fundamental about indivisible particle that made up all matter.very particle of matter for a matter is different to the particle of any other matter. Particle Theory of matter is a very important theory, which is used to understand various processes occurring in our day-to-day lives.