5. Scientists have long investigated stem cells' potential for growing hearts, and they reached a major milestone this year when they created heart tissue than can beat on its own.
6. There are few chief executive decisions that drew more attention this year than Yahoo(YHOO, Fortune 500) CEO Marissa Mayer's work-from-home ban. The policy was initially seen as highly controversial and had a lot of people upset because of its perceived lack of flexibility.
"For IBM, although they regularly top the list of U.S. patentees by volume of patents each year, the Top 100 Global Innovators listing evaluates not just volume, but also success, globalization and impact," said Bob Stembridge, analyst with Thomson Reuters.