We easily see the flashy invention that combines everything that came before but often fail to recognize those dependent inventions.
If it wasn't Newton/Leibniz, it would have been someone else. Galileo may have been the first/most prominent, but if it weren't him, it would have been someone else.
And it would have been someone else if not him. Maybe not exactly right then, but in that time frame.
We were ready to discover these things. Let me put it this way, if Galileo lived in another time frame, he would have discovered calculus. He would have invented the steam engine. Etc.
Yes, his intellect allowed him to be able to get there, but a man like Galileo would have been at the forefront of his chosen field in any time period. And many men like Galileo have existed throughout time. Even contemporaneously with Galileo.
As for the simultaneous rise of agriculture everywhere, could it simply be that much of the productive farmland got flooded circa 12,000 BCE when the sea levels rose 100 feet? [2]
[1] - https://en.wikipedia.org/wiki/Analytical_Engine
[2] - https://en.wikipedia.org/wiki/Early_Holocene_sea_level_riseNot to mention that such a phenomenon is not exact (there's no sharp dividing line between "non-ag" and "ag"), "agriculture" embraces lots of disjoint activity (rice needing water to support it vs wheat in a dry field), and "simultaneously" covers centuries if not millennia.
Examples: TV, jets, VCR, desktop computer (existed in 60's), GUI, personal digital assistant ("smart phone"), neural nets.
Not to detract from the rest of the article but this is probably the least derisive, fair summary of GH’s work I have come across anywhere close to on a “mainstream” tech news site. Hell must be freezing over if people aren’t calling him a charlatan without actually bothering to read his work and listen to him, first hand, articulate his rationale.