I don’t have a PhD in zombiology but zombies will bite you wherever they can. Depending on what kind of zombies we’re talking about a bite alone might turn you or not. So body armor could be useful for some kinds of zombies and utterly useless for others.
Maybe some countries’ patent offices don’t take their job serious, but in general there are loads of things you can patent. For example basically anything naturally occuring is not generally patentable, but you can patent methods for synthesising or extracting naturally occuring things.
As long as the tits aren’t used for commercial purposes you don’t need a license. Anyway, I doubt that in Europe you could patent any naturally occuring molecules in any kind of milk.
The Expanse is the only sci-fi franchise I know that has bicycles. They’re the perfect means of transportation in a post-apocalyptic world, no need for fuel except for food that you need anyway.
To demonstrate I got an app to crash, this is what you see when you click on the report button. The report is longer, trying to show where the app crashed, at the bottom there’s a button to send a report to apple