Is probably from the USA.
You say this as if you were British, but then the rest of your comment seems to suggest that you're not (in which case it's not surprising that you might be unaware of some aspects of British playground culture).
It is a part of our culture, like pubs, pooh sticks, morriss dancing or cheese rolling.
It would be a totally valid citizenship question.
Maybe you're a city child?
It's clearly the implication that you shouldn't have to Google for it. That isn't directness, it's passive aggressiveness, which the Dutch are not stereotypically known for.
It certainly is a mainstay. A yearly treat which children love. In Ireland I was taught this song in school: https://m.youtube.com/watch?v=bhebvq0O4GY (and I still remember all the words)
For sure it is. Every boy (and probably some girls, but never seen myself) plays conkers and likely puts their life in great peril climbing horse chestnut trees to gather the best conkers before anyone else gets them.
When I think back now to some of the massive (old) trees I used to climb and the action of shaking the branches to try to get the chestnuts to drop (whilst the branch is breaking underneath you, 100ft up), I’m surprised I’m here to talk about it!
This is a serious business.
Then I learned that it was a game from an episode of Kipper the Dog, in which his cheeky friend Tiger cheats at the game by painting something to look like a chestnut.
Well it is the author's expectation, isn't it? I also left the article wondering what in the world conker was. I don't think it matters where the game is from or where the reader lives. It's just good writing to do a bit of explaining for the foreign readers, of which The Guardian knows they have.
I have no clue about american football rules - I barely know the sport exists, the ball has a funny shape, and that it's popular in the states. Still it would be absolute nonsense to explain their basics every time someone talks about them and I won't expect anyone to do so. Explanations like that will just annoy the vast majority of readers, who will have a preexisting interest in the sport and thus will already be familiar with the rules.
That said, I had even less of a clue what the hell conkers is. Luckily I have basic technological literacy and was able to find the wikipedia article[1] in a fraction of the time it takes one to complain.
I guess your point makes sense, though. There isn't the obligation to explain anything. I just personally think it's good writing to anticipate what your readers may not likely understand.
In any case, the comment I replied to already made the claim. I deliberately weakened it by saying it was a stereotype rather than talking as if it were unconditionally true.
A horse chestnut tree can reach heights of approximately 30 to 40 meters (about 98 to 131 feet) [1].
I used to go pretty damn far up, one time really shitting myself up as the thinner weaker branches started breaking away as I was climbing higher.
It genuinely felt like, even if probably not entirely true, that I was sticking my head out of the top of the tree before it started giving way. It’s a memory that will stick with me forever!
Of course I can’t prove this, but it’s not entirely implausible that a very old horse chestnut tree could be over 100 feet high and it’s not entirely implausible that it’s possible to climb up a tree of that size. So I guess either take my word for it or not, your call ;)
[1] https://directree.org/horse-chestnut-aesculus-hippocastanum/
https://news.ycombinator.com/newsguidelines.html
p.s. Also, if you're talking about https://news.ycombinator.com/item?id=41844648, I don't think you've characterized that comment accurately or fairly. As the site guidelines ask, "Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith."
It's a load of different morriss dancing troops dancing around the town with a parade with the lot of them. And there are a lot. Bloody freezing some years though!
Also, in the same vein, this weekend I think there's the annual Sea Shanty festival in my home town.
https://harwichshantyfestival.co.uk/
The videos are quite bad at conveying how great some of the groups are, especially sitting in a smallish pub with a pint listening to some amazing singers do sea shanties. Quite magical.