> Your note about them not falling in makes me wonder if Google had a different answer? It's the kind of question that's asked in interviews because it has sev

> Your note about them not falling in makes me wonder if Google had a different answer? It's the kind of question that's asked in interviews because it has several answers and a good candidate should be able to think it through and suggest a reasonable number of them and demonstrate their ability to creatively think through a problem. That round covers can't fall in seems one of the simplest and most important, given that a cover that falls in could kill or seriously injure a worker. https://www.livescience.com/32441-why-are-manhole-covers-round.html https://www.livescience.com/32441-why-are-manhole-covers-rou...