According to Paul Reber, professor of psychology, Northwestern University, the human brain consists of about one billion neurons. Each neuron forms about 1,000 connections to other neurons, amounting to more than a trillion connections. If each neuron could only help store a single memory, running out of space would be a problem. You might have only a few gigabytes of storage space, similar to the space in an iPod or a USB flash drive. Yet neurons combine so that each one helps with many memories at a time, exponentially increasing the brain’s memory storage capacity to something closer to around 2.5 petabytes (or a million gigabytes). For comparison, if your brain worked like a digital video recorder in a television, 2.5 petabytes would be enough to hold three million hours of TV shows. You would have to leave the TV running continuously for more than 300 years to use up all that storage.

The human brain has always been one of the most intriguing mysteries on earth. Meet Steven Wiltshire, also known as the human camera. When he was 11, he drew a perfect aerial view of London after a helicopter ride.

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Watch this living camera in action in this amazing video, where he draws a panoramic view of the city of Rome from memory after a single hour long helicopter ride.  Miracles such as Steven have been given several names throughout history. But it is only today that scientists are beginning to be able to watch the brain as it is thinking, to unravel the mysteries it holds.