Neurotransmitters and hormones are the chemicals which control every system and process within the body. Norepinephrine is both a neurotransmitter and a hormone. As a result, its role within the body is essential to normal body and brain function.orepinephrine's role as a brain and body stimulant requires a certain level of this chemical to be present to achieve normal mental and emotional function. Its primary mechanism is that of arousal.
A normal diamond pickaxe has 1562 durability so it may get you as much stone with that pickaxe. With Unbreaking III however, that may quadruple your mining count, or around 6248 stone. Efficiency enchantment just makes mining faster and does not improve durability. Sources: http://minecraft.gamepedia.com/Pickaxe
It's important to note that a diamond's carat weight does not equal size. Because of differences in depth and cut, two diamonds with identical diameters may in fact be two completely different sizes. Therefore, it is possible to buy a diamond that looks bigger than another that may actually have a smaller carat weight. When buying a diamond, consider the length, width and depth of a stone as well as the surface of the diamond (the part that will actually show when the diamond is set).