Why is California called the Golden State?

California is called the Golden State not because of the gold found at Sutter’s Mill in 1848, but because winter rains make the hills green until the dry air of summer turns them a golden hue.

The theory of disruptive innovation has been a powerful tool for predicting which industry entrants would succeed. But the " disruptive" label has often been applied incorrectly, simply because a newcomer shakes up a market. In December, the theory’s architect, Clay Christensen, and his coauthors tried to correct the misunderstanding.