<![CDATA[The human brain has 86 billion neurons that make trillions of connections. Grafissimo/DigitalVision Vectors via Getty Images]]>

677159 image 1748618344 1748618344 <![CDATA[The human brain has 86 billion neurons that make trillions of connections. Grafissimo/DigitalVision Vectors via Getty Images]]> The human brain has 86 billion neurons that make trillions of connections. Grafissimo/DigitalVision Vectors via Getty Images

]]> 1214