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I've always thought it was because concrete is slightly radioactive, personally. Rightly or wrongly so, its been yet another reason to avoid the oil-debt and walk, or cycle, to work.

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Are you serious?

Yes, quite:

http://hps.org/publicinformation/ate/q1543.html

And:

http://en.wikipedia.org/wiki/Environmental_impact_of_concret...

I haven't been seriously thinking about it, like I said it was just a fancy, not a seriously considered notion, and anyway it nevertheless resulted in a healthier response: I void driving, and thus parking, and thus parking in concrete structures.

Reading your comments, you vacillate between taking radioactive heating from concrete seriously, and not.

Doing the right thing for the wrong reason is not an effective strategy.

Concrete is radioactive, I'm reminded of this fact when I go into a concrete parkhouse and feel the heat, and I don't particularly care if its hot due to radiation or hot due to heat energy from cars being stored - either way, the darn places are uncomfortable and I avoid them.

I'm not particularly bothered if I'm "wrong", its just a cute thing to say .. "oh, its so radioactive in here, lets get out.."

It sounds more crazy than cute to me.

Well, next time you walk into a stinking hot concrete bunker, say to yourself "I wonder if I know what the word radiation means, hmmm.."

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