20 points 3. Assume that there are 10 billion nerve cells (called neurons) in a human brain. Each neuron is always in one of two possible states (say, on or off). The state of the brain is given by the states of all the neurons. Assuming 210% 103, calculate the number of possible states of the brain in powers of 10. Compare that with the number of atoms in the universe estimated to be much less than 10500