Facts on the Brain

The study of the human brain has been called the last frontier in science.

The field of neuroscience is still in its infancy, but is rapidly exploding — turning yesterday’s brain “facts” into today’s brain “myths.”

Experts agree there is more we don’t know about the brain than we currently know. (1)

Here are some of the most interesting brain facts backed by science.

Some will fill you with awe.

Some will make you pause and think.

Others will make you realize what an imperfect “machine” we’ve got running the show.

We think at least a few of these will … Blow. Your. Mind.

Human Brain Facts by the Numbers
The most complex entity known resides between your ears.

Here are some of the fascinating facts and figures about the human brain.

The typical brain is about 2% of a body’s weight but uses 20% of its total energy and oxygen intake. (2)
Your brain is 73% water. It takes only 2% dehydration to affect your attention, memory and other cognitive skills. (3, 4)
Ninety minutes of sweating can temporarily shrink the brain as much as one year of aging. (5)

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Your brain weighs about 3 pounds. Of that, the dry weight is 60% fat, making your brain the fattiest organ. (6)
Twenty-five percent of the body’s cholesterol resides within the brain. Cholesterol is an integral part of every brain cell. Without adequate cholesterol, brain cells die. (7)
No one knows for sure, but the latest estimate is that our brains contain roughly 86 billion brain cells. (8)
Each neuron connects with, on average, 40,000 synapses. (9)
A piece of brain tissue the size of a grain of sand contains 100,000 neurons and 1 billion synapses all communicating with each other. (10)
All brain cells are not alike. There are as many as 10,000 specific types of neurons in the brain.