OpTest's "OpTiSurf" is indeed a new way to measure surface roughness. According to OpTest, "The OpTiSurf revolutionizes the measurement of surface roughness of paper. Using advanced optics and algorithms, it quickly quantifies the optical roughness of entire sheets. OpTiSurf correlates with traditional air leak tests but has greater precision and speed, with less maintenance." And I would emphasize that no air is required. I suggest you look at it today--just click on "More" below.
And when you talk to OpTest, please say hello for us here at Nip Impressions.
Answer to last week's riddle: These are the countries (in order) from which the first 8 Secretaries-General of the United Nations have hailed.
Last week's riddle asked: "Norway, Sweden, Burma/Myanmar, Austria, Peru, Egypt, Ghana, South Korea. What's the pattern? (Hint: Order matters)"
This week's riddle: 4 hikers (Adam, Barbara, Catherine, and Dan) need to cross a narrow bridge over a roaring river with the aid of two poles. Either 1 person (with both poles) or 2 people (with one pole each) can cross the bridge at a time. It takes Adam 10 minutes to cross the bridge, Barbara 5 minutes, Catherine 2 minutes, and Dan 1 minute. What is the minimum time it takes to get all four hikers to the other side of the bridge? (No pole-throwing, space ships, or other heroic assumptions allowed.)