My current most interesting read is Joel Mokyr's The Lever of Riches.
Having read roughly a quarter of the book...first, I find it fascinating. What has actually made a difference in tech growth over the last 2000 years. More interestingly in the first 5-6 chapters...what was the tech growth between 0 AD and 1900 AD.
Economic growth has primarily been constrained by 3 things over the last 2000 years:
Materials: You can't make good, lasting clockwork watches or gun barrels out of wood.
Power: How much energy output can an average person exert to productive purpose in a day?
Innovation: How much improvement do people do?
These things are fascinating...in the post-roman years before 1000AD, for instance, it's arguable that the 2 most important inventions were the non-choking horse collar (which quintupled a horse's effective output) and the heavy plow (which tripled the effective yield of an acre of grain, in typical european soil). I also heard it argued that the heavy plow itself is the single technology responsible for the manorial life: The amount of calories that can be produced by 1 person with a heavy plow is ~3x the amount of calories that could be produced by a person without. However, the capital investment of a heavy plow is far too much for most individuals.
On this line of analysis...we still have these 3 lines running.
Materials science still has the potential to give us room-temperature, or even liquid nitrogen superconductivity.
Shale oil/Shale gas is pushing the price of energy down right now...and solar is expected, at historical rates of Moore's law-ish increase, to cross the petroleum threshold in ~20 years.
And Artificial Stupids, even without AI, threaten to give us a serious force multiplier on Innovation sometime in the next 30 years..