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.
Werner Heisenberg invented matrix mechanics, the first formalization of quantum mechanics in 1925. His uncertainty principle, discovered in 1927, states that the determination of both the position and momentum of a particle necessarily contains errors, the product of these being not less than a known constant.