Notes

Facts about the nervous system:
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1: Thoughts from the brain travel at over 260 kilometres per hour.
2: The brain consumes 20 percent of your total energy and oxygen.
3: The length of all the nerve fibres in a single brain stretched out would reach approximately 100,000 miles.
4: The brain has no pain receptors. It is only the skull and bones that hurt.
5: Your brain could generate 12 - 25 watts just by sitting idly and thinking.
6: If your brain were a digital recorder, it would have a storage capacity of roughly 2.5 petabytes. To put that in perspective, that’s enough to hold three million hours of TV shows—you’d have to leave the TV running for over 300 years to use it all up.
7: An adult brain contains roughly 86 billion neurons. These are connected by trillions of synapses. If you lined up all the neurons in your body end-to-end, they would stretch for about 600 miles.
8: You actually have a "second brain" in your digestive tract called the enteric nervous system. It consists of 100 million neurons and can operate independently of the brain in your head, which explains why you get "butterflies" when you're nervous.
9: Your brain is physically reshaped by your experiences. Learning a new skill, like juggling or a second language, actually increases the gray matter density in specific regions of your brain.
10: During sleep, the glymphatic system opens up. It essentially "flushes" the brain with cerebrospinal fluid to wash away metabolic waste (like amyloid-beta proteins, which are linked to Alzheimer's).