Audiences don’t just want to sit and watch anymore. Sometimes they want to get involved as well. To that end, TV and films are now harnessing the power of crowdsourcing.

With a struggling economy and corporate giants to compete with, America’s inventors have not got it easy. But that doesn’t stop them trying.

Making sound for films isn’t just a case of leaving a microphone on the set and pressing “record.” Sometimes reality just isn’t good enough. That’s when Oscar-winning sound designers like Richard King of “Inception” have to get creative.

Video games are now big business: $10.5 billion sales in the U.S. alone big. As the industry grows, the line separating Hollywood from interactive entertainment is getting blurrier.

Martial arts are no longer confined to dojos or expensive seminars. Now you can find video lessons online. But are they any good? And can you really learn a martial art from a video?