Thanks to mirror neurons (a good read is Marco Iacoboni's "Mirroring People"), we humans transmit our feelings and moods to others. In this Darwinian economy, what we want to be transmitting on job interviews is confidence and ability to go the distance to get employers' goals accomplished. Static enters is we feel nervous or even appear to be nervous.
No surprise, reports CNN MONEY, Harris Interactive and Everest College found that a fear among job seekers. About 17% indicated they was afraid that they would come across as nervous. Confidence is the currency of the current economy.
Well, there is a proven way to get oneself centered emotionally and resistant to the jitters. Silicon Valley has been bringing it mainstream. It's mindfulness. The July 2013 edition of WIRED has a major article by Noam Schachtman on how employees at companies like Google and Facebook practice mindfulness or meditation to get cognitively and emotionally grounded. That shows in both how they comport themselves and in how they think about projects.
How to meditate can be learned from a book, article, or one session with an instructor. For those who push back on religion, the fundamentals of mindfulness can be unbundled from their roots in Eastern Buddhist philosophy. Just grab onto the tactics and leave the religious concepts behind.