system
Given the following post, respond as if you're commenting on Reddit:
human
What's the reason of sudden advancing in human technology during 20-21th century?
gpt
Ah, there's no alien technology found. All of these advances were made by good ol' fashioned human ingenuity. Our advances were fast because:

1. Great thinkers, mathematicians, scientists, and engineers have already discovered or developed a foundation that we can build off of. The unification of electricity and magnetism by Maxwell allows us to be able to generate power from hydro dams, for example. Newton already invented calculus, which we need to use to calculate things like how to build a bridge. We also need calculus to derive more mathematical proofs/equations, etc. This brings me to the second point:

2. The advancement of knowledge compounds. The rate of knowledge/advancement gets faster as more knowledge is discovered/created. For example, advances in computer technology allows us to build devices that can image smaller computer chips, allowing us to learn how to build even smaller computer chips, which would allow for greater computational power, which would let us build even better devices to image these smaller computer chips,....etc..

3. As a corollary to #2, rate of advancement grows because the advancement in one field of science/engineering can impact the advancement of a different field. For example, better computing power allows biologists to simulate protein structures, which allows biologists to learn faster about protein functions. This knowledge of proteins could lead to medical advances and cures for diseases. To make these cures, new engineering problems would have to be solved (i.e. better/faster ways of making these cures on a large scale), which would cause growth in another area of science/engineering. Now you are able to save more lives and support a larger population of people.

4. The increase in population is also a factor in scientific advancement. Ignore all the sensational BS that people like to say about how the world is over-populated and that we need to stop the poor people from reproducing. We have advanced so fast BECAUSE we have 7 billion people living at once on the planet. Knowledge is stored IN PEOPLE, NOT IN BOOKS. Sure, you can learn things from books, but nothing beats going directly to the person, and asking your very specific yet very important question. If you don't understand what something in a book says, you're screwed. If you don't understand what the person is saying, you can ask them for clarity. Then they can draw on past experiences to better instruct you. Remember that books don't advance science/engineering, PEOPLE DO. 

5. We have so many people living at once learning and researching. They can also speak freely to each other and share ideas (for the most part). This sparks new ideas, and interdisciplinary collaborations that generate new inventions and devices faster. You need a new set lungs? That means you'll need a biologist to find a suitable donor, a chemist to synthesize the immunosupressants, a doctor to tell you how much immunosupressants to take, a surgeon to remove the lung from the donor, an engineer to build a suitable carry-case for the lung during transportation, another surgeon to implant the lung into you, and nurses to monitor your condition post-surgery. OH WAIT, you wanted an MECHANICAL LUNG? Well you need a biologist to figure out what materials are suitable for implantation, an mechanical engineer to figure out how to build the device, an electrical engineer to make the necessary electronic components, a surgeon to implant the lung, and maybe a computer engineer to monitor the status of the iron lung.