For the typical reader of HN, phylogenetic trees would be far easier to figure out in a few days than how neurons work, especially as "how neurons work" isn't even established.
Easy as pie.
Edit: Here's a freely available relatively recent article on just one aspect of neurons, the synaptic proteome, which contains about 1,466 proteins [0].
I will check back in a few days once you've figured out how they all work together.
Or think in terms of code: it is easy to understand what some code does, but to understand why it is like that you need to know a lot more about the context surrounding the problem.