The brain has about 86 billion neurons which transmit information via electrical and chemical signals. To communicate this information the brain requires 100 trillion connections which are called synapses. In the past 30,000 years the human brain has shrunk by about 10%, which could be related to evolutionary efficiency. You live approximately 80 miliseconds in the past, as this is the time it takes your brain to process and assemble information. Half of all human brains may have the parasite toxoplasma gondii, which has been shown to encourage risk taking. Your brain cannot feel pain as it has no pain receptors. Headaches are produced by pressure on the blood vessels surrounding your brain.
This short 1.5 minute video will give you some interesting insight into the most complex part of your body.