Outliers

I'm reading the book, "Outliers" by Malcolm Gladwell and sincerely enjoying it...

An excerpt from the book:
"High tech companies are convinced that those at the very top of the IQ scale have the greatest potential. Microsoft, famously, asks job applicants a battery of questions designed to test their smarts, including the classic...

*I want you to post comments as to what you think the answer is. I'll post the answer tomorrow*

Q: Why are manhole covers round?