It 's arguably apple 's number one talent : whetting people 's insatiable appetites with new devices ] , from the point that a product is unveiled to the time it arrives in stores ( or in your mail ) and beyond .
But nanotubes have other qualities that are whetting the appetites of engineers : they 're excellent conductors of electricity and heat , and they can be used as wires , semiconductors or superconductors .
Can experience to whet difficult is a kind of quality , presume to whet difficult is a kind of courage , be good at whetting difficult is a kind of wise and farsighted .