Telephone conversations may never be the same again, now that KishKish has introduced its Lie Detector. An add-on for Skype's voice over IP service, the KishKish Lie Detector gives you a graphical representation of the stress levels of the other party to the conversation. For the first 10 seconds, the software calibrates the speaker's general stress level. Then, it monitors changes in stress as the person speaks. The theory is that because lying is stressful, it tightens the vocal cords and pushes the voice into above-normal registers. KishKish also makes other add-ons for Skype, including answering-machine software and a conversation recorder.