On the Internet, We Must Be Both Detectives and Seers

The detective means: we must have the ability to infer, or even reconstruct, historical truth from the clues and traces of known facts.

The prophet means: we must have the ability to speculate about the unknown based on what is already known.

History: restoring the truth of the past from known evidence and learning lessons from it.

Mathematics: the science of solving for the unknown based on the known.