The contact with nature has a direct influence on our mood, when walking through the woods or along the beach we feel a strange sense of relief and we enter a state of tranquility similar to that we have a few minutes before falling asleep . According to researchers from the Department of Psychology at the University of Michigan, this is because nature stimulates the alpha waves of our brain, those that are at a frequency between 8-13 Hz and that arise from a synchronous electrical activity, ie , when all the cells of our brain meet calmly.