It’s difficult to make tax collection management interesting, but D.C. Attorney General Irv Nathan sure is trying.

Around 11:30 this morning, staff members found a suspicious envelope in the mailroom at Fletcher Johnson Education Center inside H.D. Woodson High School, located at 4650 Benning Road SE. A D.C. Fire and EMS special operations team responded to the scene and are investigating, along with other law enforcement officials, including representatives from the FBI.

Have you ever wanted to make really good invisible ink? Well, the Central Intelligence Agency has a reliable recipe it’s now happy to share. As part of a large declassification of the U.S. government’s six oldest classified documents, the CIA has made publicly available a number of tips sure to amaze your six-year-old nephew, like how to make invisible ink and how to open envelopes without breaking the seal.