Our brains constitute of about 86 billion nerve cells. For comparison, note that there are about three hundred billion stars in our galaxy. If these nerve cells were laid end to end, they would stretch around our planet four and a half times.

But its not the mind-blowing number of cells that make the human brain such an extraordinary organ - its their interactions with one another. It’s the complex manner in which they connect with each other that makes us so intelligent. In fact, your brain forms about a million new connections with each second that passes by, and the patterns of these connections are constantly changing.