You may be about to go on stage to speak before a difficult audience. Maybe you're getting ready for a job interview. Or you could be about to present at a high stakes meeting. There is a way you can automatically feel powerful when speaking in public or giving a presentation. It's all about mastering body language. Yes, there is a body language of power. I'm not talking about "posturing" and psyching the other person out. Power is about putting your body into certain positions before you enter the presentation room. There's a science to body language and power. Amy Cuddy, a social psychologist, explains how to go from powerless to powerful and it's all in your control. Watch her TED talk to learn how these positions can make you a powerful leader, public speaker, or job candidate.