I am at point A. I want to go to point B. I don't have a plan or a map. There are many roads that lead from point A to point B, but right now, i can't see which. My only plan is to get to point B. I keep walking. On rare occasions while i walk, i can briefly see with absolute clarity, the reason why the road i am walking on couldn't possibly lead to point B. I stop, I have a cup of tea, I mark the road as "No Way!" and I change course. I keep walking. Hoping that someday, one by one, i will have eliminated all the roads that do not lead to point B. If i can still keep walking then, i will be on one of the roads that lead from point A to point B.
"Hydrogen is a light, odourless gas, which, given enough time,
turns into people."
~ Edward R. Harrison (1919-2007), Cosmologist.