Manhole covers are round for a mix of safety, engineering, and practical reasons. A circular cover can't fall through its opening, regardless of rotation, making it safer for workers and pedestrians.

When walking down the street, you probably don’t stop to notice the manholes on the road. And if you have, you may not have realized that nearly all of them are round—or that those with other shapes ...

Forbes contributors publish independent expert analyses and insights. Dr. Lance B. Eliot is a world-renowned AI scientist and consultant. Have you been asked about manhole covers in any of your recent ...

NASHUA – Perhaps the most unusual product ever made by a Nashua company is still going strong, despite efforts to replace it with a more modern version – not to mention the fact that you and your ...

You see them in every city across the world, but what is a manhole exactly? Manholes have been around for decades and usually go unnoticed to the average city resident. With around 12 million sewer or ...