I think it is the Microscope. Robert Hooke was a scientist who came up with the law of elasticity, the Hooke's law as well his pioneering work using the microscope to document observations of a variety of samples in his book. Hook published a book Micrographia, an accurate and detailed record of his observations through his microscope.
In a personalist regime, the power is held by a single leader, whose demands become law for the entire country.
This regime is a form of autocracy. It is a government system that operates as an absolute monarchy or a despotate. Personalist leaders are able to appoint friends or family to important offices. As a consequence, population gain respect for their leader. For example, the Kim dynasty in North Korea.
It was "mountain ranges in the north and west" that helped India develop for thousands of years in this way, since these mountains were very hard to cross with large armies.
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