What does your voice say about you?

Your accent can nod to where you come from; the pace of your speech can reveal your emotional state; your voiceprint can be used to identify you. Linguists, companies and governments are now parsing our voices for these details, using them as biometric tools to uncover more and more information about us. While a lot of this information is used to make our lives easier, it has also been used to controversial and worrying effect. And the next frontier of voice technology means we may not be able to trust what we hear -- even if we appear to have said it ourselves. Much like a fingerprint, we all have a unique voiceprint.