1. A method, comprising: receiving, using a processor of a computer, data comprising an entity having a feature; determining how the entity correlates with an existing entity; generating an entity resolution assertion having a confidence score; determining that there is a consequence based on the confidence score and the entity resolution assertion being wrong; identifying an additional feature for the entity to increase the confidence score of the entity resolution assertion, wherein the additional feature is not received with the entity; searching an external data source for the additional feature to obtain an observation containing the additional feature; and performing entity resolution using the at least one feature and the additional feature.