1. A device, comprising: a question-answer system comprising software for performing question answering processes; a receiver receiving a question into said question-answer system; a processor connected to said question-answer system, said processor: generating candidate answers to said question, determining a confidence score for each of said candidate answers, evaluating sources of evidence used to generate said candidate answers, identifying missing information from a corpus of data, said missing information comprising any information that improves the ability of said question-answer system to understand and evaluate said sources of evidence associated with said candidate answers, said identifying said missing information comprising: evaluating a piece of evidence and producing an evidence score according to a scoring process that reflects a degree to which said piece of evidence supports or refutes said candidate answer, classifying said piece of evidence as marginal evidence if said score is below a threshold value, and evaluating said marginal evidence to identify said missing information, and generating a follow-on inquiry based on said missing information; and a network interface outputting said follow-on inquiry to external sources separate from said question-answer system to obtain responses to said follow-on inquiry and receiving from said external sources a response to said follow-on inquiry, said processor inputting said response into said corpus of data.