Your challenge is to correctly identify the item and its location from the picture below. Clue: It’s somewhere at the NCI campus at Frederick or Fort Detrick. Win a framed photograph of the Poster Puzzler and have your photo featured on the Poster website by e-mailing your guess, along with your name, e-mail address, and daytime phone number, to poster@mail.nih.gov.

Each day at 6 a.m. the lights pop on inside 18 buildings on the NCI at Frederick campus, illuminating the residential quarters for thousands of research mice. For the mice, it’s the end of their nocturnal day. For their caretakers, however, the day has just begun.

It looks like we stumped you. None of the puzzler guesses were correct, but our winner was the closest to getting it right. He guessed it was a sanitary sewer clean-out pipe, and that’s what the photo looks like, according to our source at Facilities Maintenance and Engineering. Please continue reading for the correct puzzler solution.

In a recent article in the Poster, I mentioned that the words “I have a dream” are not to be found in the manuscript that Dr. Martin Luther King Jr. took to the lectern on Aug. 28, 1963, during the celebrated March on Washington for Jobs and Freedom demonstration. When he sensed that his prepared speech was missing the mark, he resorted to the “dream” speech, which he had given several times previously, albeit not on the national stage.

As the anniversary of the birth of the Rev. Dr. Martin Luther King Jr. approaches, I’m reminded of two other, equally noteworthy, events that have special meaning to aficionados of excellence in speechifying. And they are especially significant to those in our geographical area; both occurred within 50 miles of Frederick, Md. The first event occurred on Aug. 28, 1963, when King delivered a speech in front of the Lincoln Memorial during the celebrated March on Washington for Jobs and Freedom demonstration.