International Fixed Calendar, as developed by Moses Cotsworth in 1902.
It's a calendar designed to be maximally compatible with the standard Gregorian while also fixing many of the problems of it.
All months are 4-weeks long, and start on a Sunday.
1. 28*13 is 364: Where does the extra day go?
2. Leap years. Does it have them? Does it go out of sync with Gregorian?
Since December 28th is (of course) a Saturday, this'd be... Sunday?
Kinda. But January 1st is also a Sunday. So it's really more a DOUBLE SUNDAY (or DOUBLE SATURDAY) situation.
So you get another 3-day weekend situation where it's Saturday-???-Sunday
Well, they're identical in terms of date: they will usually have different days of the week.
But what does this have to do with Kodak?
From 1928 to 1989, they ran their business by the IFC instead of the gregorian calendar!
The League of Nations had narrowed down their calendar proposals to just two, including Eastman's (I'm not sure what the other was)
They discovered something in 1946 that wasn't publicly known and was supposed to be top secret. And they sued the government over it.
This was initially covered up as an explosion at an ammunition magazine, but was revealed as a nuclear test after the bombing of Hiroshima.
1. long half-life fission products, un-fissioned material, and weapon residues
2. short half-life sand & dust.
Or when you're testing in your own country, that dust is raining down on your own crops, even 5 states away.
Most of this was very diffuse and not super dangerous, but it was over a very large area, and there are ways it could get concentrated.
And a paper mill in Indiana that was making cardboard pulp from corn husks was inadvertently using river water contaminated by the Trinity fallout.
Because they shipped their film in cardboard containers, made from a paper mill in Indiana.
In January 1951 the US government started testing in Nevada, with the Operation Ranger series of tests. These were the first tests inside the US since Trinity.
And Kodak's reply was: YOUR TESTS ARE GOING TO COST US MILLIONS IN RUINED FILM, AND WE HAVE LOTS OF LAWYERS.
But for reasons of secrecy, they weren't told.
And not just people living in the immediate area of the nuclear tests: Farmers weren't told either, and it's not known to what degree crops & livestock were contaminated
A research project in the 50s-60s collected baby teeth from the St Louis area and measured how much Strontium-90 was in the teeth.
All the above-ground tests were in Nevada and New Mexico, over a thousand miles away.
Partial Nuclear Test Ban Treaty in 1963.
This banned above-ground test detonations of nuclear weapons. From then on, they'd all be underground.
Naturally most of those countries don't have nuclear weapons so it doesn't really affect them.
China, France, and North Korea.
For comparison, the US tested 231 non-underground weapons and the USSR did 229, with the UK doing 21.
Yes, that's SLIGHTLY batshit insane, but on the other hand you really can't beat it for sheer power.
It makes most rocket engines, even the giant ones used on the Saturn V, look about as powerful as a super-soaker.
Like, how many thriller novels and shows like 24 have had bad guys getting their hands on enough material to make a dirty bomb by stealing it from a research lab, or a crumbling ex-soviet state?