“Blood flashes through the brain in a matter of seconds, one quarter of all the blood from the heart, darkening as the brain takes the oxygen out of it. Thinking, perceiving and feeling, and the control of our bodies, most of it unconscious, are energy-intensive processes fuelled by oxygen.”

“Blood flashes through the brain in a matter of seconds, one quarter of all the blood from the heart, darkening as the brain takes the oxygen out of it. Thinking, perceiving and feeling, and the control of our bodies, most of it unconscious, are energy-intensive processes fuelled by oxygen.”

— Henry Marsh