What are Conkers? & What is Conkers?

What's a conker? And what is conkers? It seems whenever I use these words I confuse someone who has never heard these names. And with it being a singular noun that can be counted, as well as an uncountable noun I am hardly helping.

But what I have done to help is explain what they are, where to find them in London and how to choose some good ones, and how to play it. Confused? I'm not surprised. Let me explain all here: Conkers in London.

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