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Daniel Immerwahr

๐Ÿ‘ค Speaker
658 total appearances

Appearances Over Time

Podcast Appearances

99% Invisible
100 Objects #2: 60-Degree Screw

In 1904, Baltimore had an enormous fire.

99% Invisible
100 Objects #2: 60-Degree Screw

And a fire that was so big and it went on for so long that, A, it completely overwhelmed Baltimore firefighters, but B, it just lasted long enough for Baltimore to desperately call for help from neighboring fire companies.

99% Invisible
100 Objects #2: 60-Degree Screw

So Philadelphia, Annapolis, Wilmington, Harrisburg, and the other firefighters rushed to

99% Invisible
100 Objects #2: 60-Degree Screw

to fight the fire.

99% Invisible
100 Objects #2: 60-Degree Screw

And, you know, they had their hoses and they were ready to screw their hoses into the hydrants and get to work.

99% Invisible
100 Objects #2: 60-Degree Screw

And when they started to do that, they realized that their hoses couldn't screw into the hydrants.

99% Invisible
100 Objects #2: 60-Degree Screw

There was a fundamental material incompatibility, which basically left them completely unable to do anything.

99% Invisible
100 Objects #2: 60-Degree Screw

And so they just watched as more than 1,500 houses burned in one of the worst fires in U.S.

99% Invisible
100 Objects #2: 60-Degree Screw

history.

99% Invisible
100 Objects #2: 60-Degree Screw

One of the examples I like is football, what we call football in the United States, a national sport.

99% Invisible
100 Objects #2: 60-Degree Screw

No one agreed what a football was.

99% Invisible
100 Objects #2: 60-Degree Screw

Different teams had dramatically different size and shapes footballs.

99% Invisible
100 Objects #2: 60-Degree Screw

Just the central object of football, the football, went undefined.

99% Invisible
100 Objects #2: 60-Degree Screw

In New York, you would stop on green.

99% Invisible
100 Objects #2: 60-Degree Screw

And it was different in Buffalo.

99% Invisible
100 Objects #2: 60-Degree Screw

And it just took a while before them to be like, oh, yeah, we should really have the same system in the same city.

99% Invisible
100 Objects #2: 60-Degree Screw

The screw thread is the way in which you achieve metal-on-metal fastening.

99% Invisible
100 Objects #2: 60-Degree Screw

And it turns out that the industrial world is full of occasions when you need to fasten one piece of metal or rigid object to another.

99% Invisible
100 Objects #2: 60-Degree Screw

Like, that's the Industrial Revolution.

99% Invisible
100 Objects #2: 60-Degree Screw

So you get these moments where, like, senators will start just talking about, like, the importance of the humble screw thread.

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