Just started this book, looks promising. A few experts from the book.
A good analogy from the book :
There's an old analogy to a cup of tea.
If you want to drink new tea, you have to get rid of the old tea that's in your cup, otherwise your cup just overflows and you get a wet mess. Your head is like a cup. IT has limited capacity and if you want to learn something about the world you shuold keep your head empty in order to lear it. It is very easy to spend you whole life swishing old tea around in your cup thinking it's great stuff because you never really tried anything new, because you could never get it in, because the old stuff prevented its enty because, you were so sure the old stuff was so good, because you never really tried anything new ... on and on in a circular pattern.
but the ale was helping. It obliterated the differences. Enough ale and everything got reduced to pure biology where it belonged.