Riddlewot

I'm the bottom part of a certain column, and the vestigial remains of something that was there long ago; but I'm still useful to you.

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I can be up, I can be down, I can be very strange indeed. I'm named after something ordered for a certain Mr Mark - but he only tried three of my six flavours.

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I'm a sophisticated system for harnessing the energy produced by nuclear reactions. I'm biggest in China, but there might be one close to you too. What am I? [non-plural form]

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I'm something you play, but to make a play on words, I could also be peas in a play.

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I'm a heraldic symbol, an energy company, an occasional tailbone and a military insignia.

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There is a mark that is used a lot / It's purpose is to make things clear / Alas most folk will notice not / If its wrongly used there when its needed here.

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My brains are mostly in my arms, three hearts beat strong, my blood is blue; But I'm a thing that's here on earth, not alien (as it may seem to you)

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I'm named after silver mountains that don't exist, and the part of me that contains glaciers is called 'land of fire'. What country am I?

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Cut me in half and I'll double in length [two words]

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I travel slowly on five, I travel fast on two, and I can fight on one.

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A journalist might write me. An architect might sketch me. An accountant might add me. What am I?

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Wash the floor. Then wash the floor some more. Then turn me all around - and you'll get something round.

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