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So a neutron star is kind of about the size of Chicago.
Unexpected elements from the BBC World Service.
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I was stuck in a traffic jam, traveling home from the Theakston Old Peculiar Crime Festival, and I notice all these lorries sitting in front of me, and on the back of the lorries they had huge, big metal containers, the containers that you see everywhere.
I noticed that the empty weight was often between two and a half and four and a half thousand kilograms.
And I got thinking, that's an awful lot of dead weight to drag around the country.
You're listening to Crowd Science from the BBC World Service.
Hi, I'm Anand Jagatiya, and in this episode, we're trying to get to the bottom of a mystery from listener Paul.
Now, mysteries are actually what Paul specialises in.
He's a crime writer.
But for this one, he's going to need some outside help.
And I asked my wife, do you think there's a way that they could improve upon the containers to make them lighter?
She had no idea.
I had no idea.
And eventually I thought, well, I know who might have an idea.
And that's when I email crowd signs.
So you were out and about and you saw on the back of a truck how heavy these empty containers actually are?
That's right.
And I was quite shocked.