Matt Ridley on why invention and innovation seem to be inexhaustable:
Technologies emerge from the coming together of existing technologies into wholes that are greater than the sum of their parts. Henry Ford once candidly admitted that he had invented nothing new: He had “simply assembled into a car the discoveries of other men behind whom were centuries of work.”
Since innovation is the application of an existing technology or the pairing of existing technologies together toward a new use, innovation requires broad interests and understanding of the world. Putting your head down and diving into one specific field is important, but pursuing seemingly disparate interests is just as important.