Our brain is apparently just a 4 gb large arrangement of electrical weights.
Not to be pedantic, but we have on the order of 100B neurons, and afaik each of them can be connected to thousands of other neurons. I assume we probably have a ways to go before we're encoding the amount of information a brain can comprehend.
Also, your brain knows how to look up things in external storage, but ML models have to keep everything in their weights even if it's not a good fit.