Weight. The weight of the human brain is about 3 lbs.
Cerebrum. The cerebrum is the largest part of the brain and makes up 85% of the brain’s weight.
Skin. Your skin weighs twice as much as your brain.
Gray matter. The brain’s gray matter is made up of neurons, which gather and transmit signals.
White matter. The white matter is made up of dendrites and axons, which create the network by which neurons send their signals.
Gray and white. Your brain is 60% white matter and 40% gray matter.
Water. The brain is made up of about 75% water.
Neurons. Your brain consists of about 100 billion neurons.
Synapses. There are anywhere from 1,000 to 10,000 synapses for each neuron.
No pain. There are no pain receptors in the brain, so the brain can feel no pain.
Largest brain. While an elephant’s brain is physically larger than a human brain, the human brain is 2% of total body weight (compared to 0.15% of an elephant’s brain), meaning humans have the largest brain to body size.
Blood vessels. There are 100,000 miles of blood vessels in the brain.
Fat. The human brain is the fattest organ in the body and may consists of at least 60% fat.

Everyone dreams. Just because you don’t remember your dreams doesn’t mean you don’t dream. Everyone dreams!
Nightly average. Most people dream about 1-2 hours a night and have an average of 4-7 dreams each night.
Brain waves. Studies show that brain waves are more active while dreaming than when you are awake.
Lost dreams. Five minutes after a dream, half of the dream is forgotten. Ten minutes after a dream, over 90% is forgotten. Write down your dreams immediately if you want to remember them.
Blind people dream. Dreams are more than just visual images, and blind people do dream. Whether or not they dream in pictures depends on if they were born blind or lost their vision later.
Color or B and W. Some people (about 12%) dream only in black and white while others dream in color.
Virtually paralyzed. While you sleep, your body produces a hormone that may prevent you from acting out your dreams, leaving you virtually paralyzed.
Snoring. If you are snoring, you are not dreaming.
During a dream. If you are awakened during a dream, you are much more likely to remember the dream than if you slept until a full night’s sleep.
Symbolism. As those who invest in dream dictionaries can attest, dreams almost never represent what they actually are. The unconscious mind strives to make connections with concepts you will understand, so dreams are largely symbolic representations.
Adenosine. Caffeine works to block naturally occurring adenosine in the body, creating alertness. Scientists have recently discovered this connection and learned that doing the opposite–boosting adenosine–can actually help promote more natural sleep patterns and help eliminate insomnia.
Dream showings. Japanese researchers have successfully developed a technology that can put thoughts on a screen and may soon be able to screen people’s dreams.