Feynman (1949) developed a wonderful geometric notation for validating particle interactions, which is today called a Feynman diagram.
An example of a Feynman diagram can be seen below illustrating an interaction between two electrons. In this diagram time proceeds from the bottom to the top of the page and the interaction between the two electrons takes the form of a wiggly line, from right to left, which represents a virtual particle transferring energy.
In 1959 Feynman gave a (teaser) lecture entitled “Plenty of Room at the Bottom” where he expressed the opinion that down at the level of the atoms “we have new kinds of forces, and new kinds of possibilities, new kinds of effects”. Today despite a lot of physicists disagreeing with Feynman that the bottom consists of interactions between particles, but rather interaction between fields, they share Feynman’s sentiment that there is still room at the bottom to find new kinds of effects.
Whether we think in terms of particles or fields we are left with the question, where is the bottom of a Feynman diagram? It could be argued that the junctions are really the only likely places to find new kinds of effects, such as consciousness.
Looking at Feynman’s Lectures (1965) again the neglected parts are the transitions at the junctions n
In fact it has been evolution and not physicists who were first to explore the bottom. Single-cellular life evolved 3500 million years ago, and multi-cellular life evolved 600 million years ago. Cells can be several hundreds or thousands of nanometres across and the proteins inside cells are often tens of nanometers in size. Amino acids that make up proteins and are derived from DNA are a few nanometers across. Atoms are a tenth of nanometer in size. Imagine a cell to be a house and each nanometer a centimetre. Every component in the house (e.g. bricks, doors, windows) to be a protein. Each millimeter to be an atom. The brain to be a planet of houses.
All those components interact using evolved electric fields; and do not interact as objects simply randomly rattling around.
Above it all somehow the brain has evolved to be calibrated, so that all those brain cells can create a real time working model of the external world using as little energy as possible. There is plenty of room at the bottom but the brain got there before us to exploit the effects that can be found there.