Why is a Manhole Cover Round? Because Microsoft!

I’ve had some friends lately go through the interview process (and some who will be soon). What I always try to impress upon people (and myself when I have to do it) is that the interviewer is bumbling around about as much, if not more than you are. I think the interview at my current job was pretty good, but then I remember this gem:

“Why is a manhole cover round?”

At the time I didn’t know that this was an open-ended question. I thought it was a riddle or a logic puzzle. I’m surprisingly good at these. I say surprisingly, but maybe it isn’t all that surprising when I answered:

“Because the hole is round.”

“…”

“Well, is that right?”

“Uh. There wasn’t supposed to be a right answer. It was just an open-ended question.”

“What else would someone even say?”

At the time I thought it was a dumb question, but another way to look at it is that they found out a lot by the way I answered. I work in a job that requires logical reasoning and troubleshooting all day long every day. We quest for the best and most logical answers. I thought I did well.

Still, I don’t know what other people answer this question with, so I thought I’d Google it (about two years after I was asked). Apparently the real reason manhole covers are round is because Microsoft started asking why in their interviews.

I was not the only one who gave the practical, boring answer, but some other answers:

“A round manhole cover cannot fall through its circular opening, whereas a square manhole cover may fall in if it were inserted diagonally in the hole. (A Reuleaux triangle or other curve of constant width would also serve this purpose, but round covers are much easier to manufacture. The existence of a “lip” holding up the lid means that the underlying hole is smaller than the cover, so that other shapes might suffice.)”

Okay, you got me. I’m not an engineer.

“Round tubes are the strongest and most material-efficient shape against the compression of the earth around them, and so it is natural that the cover of a round tube assume a circular shape.”

I’m still not an engineer. This would explain why the internet is so strong, it also being constructed from a series of tubes.

“It’s easier to dig a circular hole and thus the cover is also circular.”

That’s a good point. I spent a lot of my youth in Cape Cod digging holes at the beach and I can’t say any of them were squares or triangles.

“The bearing surfaces of manhole frames and covers are machined to assure flatness and prevent them from becoming dislodged by traffic. Round castings are much easier to machine using a lathe.”

Yet again, these are things I didn’t realize. For all you machinists, score one for you.

“Human beings have a roughly circular cross-section.”

Here are the dumb answers I was looking for! Phew, all of these alternate answers were making me feel inadequate! This one I can totally feel superior to: “We’re kinda (but not really) circle, so they are too!”

“Tradition.”

…and I burst out into song, from Fiddler on the Roof. TRADITION! TRA-DI-TION! TRA-DI-TIOOOOON! To me, this answer is like saying: “Because that’s how God made it.” or just, “Because.” Even traditions have origins, people. I call FAIL on this answer.

Important to note, upon some investigation, not all manhole covers are actually round. Yes. The question itself makes an incorrect assumption. While round is most common, they also come in square and triangle. I think this easily ties into the message I was trying to send here. People who are interviewing currently, and will be soon as you graduate, don’t be too nervous as you interview. Know that the questions you will be asked and the people that ask them are flawed. They make incorrect assumptions, they steal things from Microsoft, and most have no right answer.

Just do the best to show your best, and you’ll do fine.

So, what do you answer if you get asked why is a manhole cover round?

Because Microsoft started asking people why.

Inhibition & Identity

All of our actions go through a personal filter. Thinking and doing are separate things. When these things approach being the same, what happens to us?

 
NYC New Years
Many of us just went through this New Years Eve. People traditionally gather on this evening for the sole intent of getting totally wasted in company just because ‘Why the heck not? I don’t have to work tomorrow, and neither do you!” Most of my peers are somewhat ‘used to’ getting drunk. The have a certain drunk identity that has been integrated into their view of themselves (or not if they like the ‘I was drunk’ excuse for every time they’re a bit tipsy). For someone like me that has lived most of their life without alcohol at all, and has a natural tolerance to not get drunk even when drinking, I wonder who the hell I was the night before. People are comfortable doing things they wouldn’t normally do and knowing they likely will do them. People are used to saying, “Oh, he’s normally a great guy. He’s just like that when he’s drunk.” I can’t pass the buck so easily.

 

I was so drunk that my vision was blurred, and I still spent most of the night with someone who is ‘my type’ while beating off a total asshole who happened to be married. So, my judgment wasn’t excessively off. How was I different?

 

I was even more bluntly crass- saying what I thought when I thought it. Little surprise there.

 

I did a few things that ‘seemed like a good idea’ and ‘made sense to me at the time’ that on further thought, may have only made sense to me. For example, if you want to counter someone’s statement that “rape is funny”, you disagree. If you then ironically grab his ass- you may think it makes a point and is great comedic timing. However, if the guy is someone to say “rape is funny” chances are, he’s not going to get it. It seemed like a good idea at the time.

 

I enjoyed dancing. The only dancing I normally enjoy is moshing or, when I used to act, musical numbers. That night, though, I danced more than I did in all of 2007. I struck an impressive figure, taring up the floor to bass beats. And if that’s not true, I’m sure people don’t remember clearly enough to contradict me.

 

I took chances. Saying whatever I want is a chance I’m used to taking. I’m not used to taking chances with trusting people I haven’t known for very long. I’ve never gone to a party at someone’s house I don’t know. I’ve never decided it was a good idea to stay there after all the people I knew well were gone. The list goes on into the night.

 

So I’m left to wonder, since these were things I never would have done without drinking, was that me?

 

The best answer I can come up with is: that is defiantly part of who I am. It was me minus certain inhibitions. It was not someone else minus those inhibitions. Underneath it all, I am the type of person to rip up the dance floor, I am the type of person to say no and slam a sliding door in an asshole’s face if they don’t seem to get it, and I am the type of person that will trust people when they’ve given me no reason not to trust them, even if they haven’t had long to give those reasons. Even if I don’t normally do these things, I at least want to on some level.

 

So what do I say to “Oh, normally he’s a great guy. He’s just like that when he’s drunk?”. I say, underneath it all, he’s really like that. The rest of the time, he’s probably just thinking or wishing those things. While they’re not the same thing, it shows you what they would do if they didn’t spend the additional moment to think. We all have that person underneath. That person for me is a good dancer, even if she’s more likely to get into sketchy situations. I’m okay hanging out that person every once in a great awhile.

 

So what about your lack of inhibition identity? Do you like hanging out with them? Do you make excuses for them? How do they measure up to your sober selves?

 

Happy New Year, everyone! I hope you’ve all recovered by now.