You're smart because your neural wiring is coated!

There's new research suggesting that how your neural wiring is coated can play an important role in determining your intelligence.

Thus supporting the idea that intelligence is partly inherited.

"The neural wires that transmit electrical messages from cell to cell in the brain are coated with a fatty layer called myelin. Much like the insulation on an electrical wire, myelin stops current from leaking out of the wire and boosts the speed with which messages travel through the brain--the higher quality the myelin, the faster the messages travel. These myelin-coated tracts make up the brain's white matter, while the bodies of neural cells are called grey matter."

http://www.technologyreview.com/biomedicine/22333/?nlid=1884/