In 2007, architect Miguel McKelvey convinced his friend Adam Neumann to share an office space in Brooklyn. That was the beginning of WeWork: a shared workspace for startups and freelancers looking for an inspiring environment to do their work. Today, WeWork has created a "community of creators" valued at nearly $16 billion.

Lisa Price worked in television but had a passion for beauty products. At her mother's suggestion, she began selling her homemade moisturizer at a church flea market. Twenty years later, Carol's Daughter is one of the leading beauty brands catering to African-American women. PLUS in our postscript "How You Built That," how professional trumpet player Dan Gosling created a special lip balm for musicians called ChopSaver.

Jerry Murrell's mother used to tell him, you can always make money if you know how to make a good burger. In 1986 — after failing at a number of business ideas — Murrell opened a tiny burger joint in Northern Virginia with his four sons. Five Guys now has more than 1,400 locations worldwide and is one of the fastest growing restaurant chains in America. PLUS in our postscript "How You Built That," how Aiden Emilio and her husband created RexSpecs — UV-protecting goggles for dogs.

Blake Mycoskie started and sold four businesses before age 30. But only in Argentina did he discover the idea he'd want to pursue long term. After seeing a shoe drive for children, he came up with TOMS — part shoe business, part philanthropy. PLUS in our postscript "How You Built That," how a long-haired Southern Californian, Chris Healy, co-founded The Longhairs and created special hair ties for guys.

In 1981, engineer Rod Canion left Texas Instruments and co-founded Compaq, which created the first IBM-compatible personal computer. This opened the door to an entire industry of PCs that could run the same software. PLUS in our postscript "How You Built That," how frustrated renter Melanie Colón created an easier way to communicate with noisy neighbors, called Apt App.

In 1978, college drop-out John Mackey scraped together $45,000 to open his first health food store, "Safer Way." A few years later he co-founded Whole Foods Market — and launched an organic food revolution that helped change the way Americans shop. PLUS in our postscript "How You Built That," how Kyle Ewing created waterproof paper through his company TerraSlate.

As a kid, Troy Carter dreamed of being a rapper, but soon discovered he was a better manager than a musician. He took Lady Gaga from obscurity to stardom – helping shape both her music and her brand. Then he turned his gift for spotting talent to spotting investment opportunities with his company Atom Factory.

App developer Apoorva Mehta almost gave up on being an entrepreneur until he figured out what he really wanted to do: find a hassle-free way to buy groceries. Five years after launch, the grocery delivery app Instacart is valued at $3 billion.

When Steve Case started out in the tech business in the mid-80s, the idea of the internet — as we think of it today — didn't exist. But with AOL, Case saw an opportunity to connect millions of people, through chat rooms, news updates, and the iconic greeting, "You've Got Mail."

Ever since she was a little girl playing dress-up in her aunt's closet, Kendra Scott loved fashion. Her first business was a hat shop, which she started at 19 – it failed. A few years later, she started a jewelry business out of her spare bedroom. Today the company is reportedly valued at more than a billion dollars.