说明：   Here we propose a new problem called the Veracity problem, which is formulated as follows: Given a large amount of conflicting information about many objects, which is provided by multiple websites (or other types of information providers), how can we discover the true fact about each object? We use the word “fact” to represent something that is claimed as a fact by some website, and such a fact can be either true or false. In this paper, we only study the facts that are either properties of objects or relationships between two objects (e.g., authors of books).