Professor Matthew Connelly

How the Trump administration is disappearing and altering historical documents — and why it matters.

There are billions of pages of government documents in the public domain in varying states of redaction, but there is no central database of these documents, and no way to compare them to one another. Enter The Declassification Engine, a project created by computer scientists, statisticians and historians to give us the most complete history of our redacted past. Bob talks to Columbia University historian Matthew Connelly about the project.