The National People's Congress of China gathers today for ten days of deliberations. Tensions with the West over the trade war and disagreement about the role of technology giant Huawei will be in the background. Bosses are not always the most reliable narrators for an investor seeking to gain insight into a company. But there are new data sources that are making it harder for executives to mislead them. And an attic in France has yielded a find some claim to have been painted by the 17th century master Caravaggio. But how do we assess whether an unsigned, orphaned work is the real, very expensive deal?