Q. I recall you writing something a while ago about spots that look like water leaks on the ceiling that might be caused by insufficient insulation. I think we might have this problem, and I don ...

Q: I recall you writing something a while ago about spots that look like water leaks on the ceiling that might be caused by insufficient insulation. I think we might have this problem, and I don ...

I’ve also seen a case where a dislodged air-conditioning duct spilled cold air onto the ceiling, creating a massive cold spot that caused moisture vapor to condense. Getty Images There are other ...

But if you look closely, you'll notice something else: a small, uncleaned black spot. The dark patch on the terminal's ceiling is located near the constellation Cancer and has baffled visitors and ...