1. The document discusses how scientists have made progress in mapping the human brain through technologies like functional MRI, but that consciousness remains mysterious. 2. It explains that consciousness emerges from distributed processes throughout the brain and that our sense of self and control is an illusion according to science. 3. The document also discusses how exercise and physical activity can boost brain power and growth of new nerve cells, suggesting fitness may offer hope against cognitive decline and issues like Alzheimer's disease.