These days, nothing is certain about the tech market or the world at large. Even Nvidia's seemingly bulletproof stock took a hammering on Monday, enduring

No matter how great a company is, even the most successful product eventually matures and declines with the passage of time as rivals angle for a piece of the market your innovation created. A case in point is Apple’s iPhone,

Apple lost the top spot in the Chinese smartphone market after a domestic brand replaced the iPhone as the country's top choice.