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This was a science fiction short story I read in the 1970s.

In the future interstellar spaceships are nuclear powered. The nuclear reactor room has thick lead walls to stop the radiation. The passageway into the reactor room has a couple of 90 degree dog-legs in it. The idea is since radiation travels in straight lines, you do not want the passageway to be a straight hole right through the lead shielding, the dog-legs stop the radiation.

Explorers on an alien planet discover some remarkably human-looking aliens with a tribal level culture. One alien is given a tour of the spaceship, and remarks that they put 90 degree dog-legs in the entrance to their huts because harmful demons only travel in straight lines.

Then some of the aliens ask if they can hitch a ride on the spaceship to its next destination. The explorers figure why not?

The punch line is that the tribal aliens are on many planets, because they discovered it was easier to be useful and hitchhike on other's starships compared to making their own starships. The dog-legs on their huts was a memory of their last hitchhiking, a few thousand years ago with some other star-faring species. The story ends with a cute sentence along the lines of "we just have to wait, another ride will be along in a couple of thousand years."

Does this sound familiar?

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    I know nothing about this story. I just wanted to observe that the element of demons moving in straight lines is a real thing in Japanese folklore. – Buzz Jan 23 '17 at 14:24
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    Also in Vermont - it was believed Witches can only fly through windows that are perpendicular, so many old homes have "witch windows" that are slanted, to prevent their entry. – VBartilucci Jan 24 '17 at 15:51
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I found it.

"Blessed Are the Meek", by G. C. Edmondson, originally published in 1955.

"What about devils?"

"I don't remember too well, but they were supposed to do terrible things to you and even to your unborn children if they ever caught you. They must have been pretty stupid though; they couldn't turn corners. My grandfather's store had devil screens at all the doors so you had to turn a corner to get in. The first time I saw the lead baffles at the pile chamber doors on this ship it reminded me of home sweet home.

The story is available at Project Gutenburg.

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