Let's set the existence-of-God issue aside for a later volume, and just stipulate that in some way, self-replicating organisms came into existence on… - Neal Stephenson

I would say that the ability of people to agree on matters of fact not immediately visible — states of affairs removed from them in space and time — ramped up from a baseline of approximately zero to a pretty high level around the time of the scientific revolution and all that, and stayed there and became more globally distributed up through the Cronkite era, and then dropped to zero incredibly quickly when the Internet came along.

If you can't test it, it's not theorics — it's metatheorics. A branch of philosophy. So, if you want to think of it this way, our test equipment is what defines the boundary separating theorics from philosophy.

There is a process known as parthenogenesis, literally virgin birth, by which a uniparental embryo can be created out of a normal egg. It's been done with animals. The only reason no one ever did it with humans is because it seemed ethically dodgy, as well as completely unnecessary given the willingness of men to impregnate women every chance they got.