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30 Under 30: In Video Show Us What You've Got. That's what we asked our 30 Under 30 candidates to do this year. And did they ever.

Seth Priebatsch , a lanky 22-year-old in a fireball-orange polo with matching orange wraparound shades perched on his crown, bounded onto the stage to deliver the first keynote speech at South by Southwest this year.

While working at Facebook in 2009, Adam D'Angelo and Charlie Cheever had a question: Why isn't there a place on the Internet where a question can be answered by someone who actually knows the answer? That question led the pair to start Quora , a Q&A website that allows users to share knowledge. You can pose a question, answer a question, and edit others' answers

This year Jessica Mah , CEO of inDinero , a maker of online money-management tools for small businesses, moved her company into a new office on the 9th floor of a downtown San Francisco high rise. She fired an employee, and hired a customer service manager. She sometimes worked 80 hours a week and ate dinner her office.

In April, University of Pennsylvania hosted the 15th annual Wharton India Economic Forum, an elite conference on growth opportunities in India. Among the attendees, who were predominately of Indian descent, was Adam Sachs, a 28-year-old Jewish kid from New Jersey. As it turns out, Sachs' two-year-old start-up, a group dating website called Ignighter.com , is one of the hottest new websites in India.

Matthew Corrin's aha moment came one afternoon six years ago in a Midtown Manhattan deli.

What do hundreds of dollars worth of parking tickets, people cued up on Southern California streets, and Vietnamese Banh Mi sandwiches all have in common?

Featured Articles How Cool is This? The definition of cool is constantly in flux.

They're making the hottest apps on your iPhone, and shirts that don't gap; encouraging you to eat healthier, and date smarter; fighting government censorship, and those extra pounds on your thighs; helping impoverished women worldwide, and kids at New Orleans charter schools. Where else would you find a more awesome and diverse group of young entrepreneurs than right here on our 30 Under 30 Coolest Entrepreneurs list? Jinnett, a professional ballerina who danced in Black Swan, wanted to help mere mortals who longed for dancer-like bodies

The young entrepreneurs on our 30 Under 30 list make and sell some of the coolest products we've seen. At the same time, they're making a global social impact, encouraging us to eat healthier, and helping us customize our own bling

The young entrepreneurs on our 30 Under 30 list make and sell some of the coolest products we've seen. At the same time, they're making a global social impact, encouraging us to eat healthier, and helping us customize our own bling.

PGT: Yani Tseng, 22, runs away to a 10-shot victory at the LPGA Championship.

PGT: Yani Tseng, 22, runs away to a 10-shot victory at the LPGA Championship.

Two-time heart transplant recipient Erik Compton has won the Nationwide Tour's Mexico Open, closing with a 7-under 65 on Sunday for a two-stroke victory over Richard H. Lee.

Some people are natural-born speakers. They were those eager young souls who volunteered to read aloud in grade school and now welcome any opportunity to present in front of a group