100,000 Miles of Blood Vessels in the Brain

There are also a hundred billion neurons that comprise the brain – as many as in the entire galaxy – all in a squishy mass about the size of a cantaloupe. Using about 17% of your body's energy and 20% of its oxygen, while only containing 2% of its mass, the brain produces between 10-23 watts of power when awake -- enough to light a bulb. Made of 75% water, your noodle has over 100 trillion synapses that connect those neurons and enough “space” to hold the entire Enclyclopedia Britannica fivefold, or 1,000 terrabytes of information. And the Cheech and Chong myth isn't true; you do use your entire brain, even when high