Spoiler
It's conker season. The rough exterior shell protects the smooth horse-chestnut inside.
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Your pictures on the theme of 'texture' - BBC News
We asked our readers to send in their best pictures on the theme of "texture". Here is a selection of the photographs we received from around the world.
I don't know what it is. But when it says "Get out of the way - I'm walkin' here," - you better move.