The definition of cool is constantly in flux. Here's a look at the companies that define cool in 2011. Plus: what it took to make it onto this year's list of 30 superstar young companies—and what the list illuminates about the state of young entrepreneurship today. Read more
Ankur Jain is the founder of the Kairos Society, a network of college entrepreneurs dedicated to changing the world through business. And socializing. Which is, in fact, business. Read more
ADVERTISEMENT
What happened to the young entrepreneurs who have appeared on our annual 30 Under 30 List in the past? Acquisitions and big paydays are among the updates. View Slideshow
