Luotkku (n): Loose snow; one of hundreds of highly descriptive words the circumpolar, reindeer-herding Saami people have for the substance.

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Cultivation (n): The practice of growing plants for a purpose, or to develop and improve them.

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Kernel (n): The seed within a fruiting body such as a berry.

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Sombre (adj): Subdued, low-key, serious or grave.

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Divide (v): To separate something into parts.

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Pond (n): A small body of water, usually still, either free-standing or created through the widening of a watercourse.

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Socialist realism: A style of art that realistically depicts workers and their lives while at the same time glorifying them.

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Lewis Silkin: A Labour planning minister responsible for New Towns, and particularly associated with the building of Stevenage, which was thus nicknamed 'Silkingrad' – not necessarily as a compliment.

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Thermosphere (n): The part of the earth's atmosphere in which auroras occur.

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Infusion (n): A hot or cold drink made by soaking a bag of herbs, tea leaves or fruit pieces in boiling water. May be flavoured with honey or other substances.

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Woven (adj): A textile made by interweaving yarns or threads at right angles to each other.

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Cloud bank (n): A dense gathering of clouds on the horizon.

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Relativistic jet (n): A plasma jet emerging from the centre of some huge object at the centre of a galaxy.

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Golem (n): A word from Jewish folklore meaning an inanimate figure brought to life by magic.

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Modernism (proper noun): An important 20th-century cultural movement that sought to reject traditional forms of making art in favour of discovering the new and radical.

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Cyaneous (adj): A variety of the colour blue, usually vivid or intense.

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Flidias (proper noun): Irish goddess of woodlands and forests.

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Frosting (n): A form of icing used to decorate cakes.

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Light pollution: A phenomenon in which excessive artificial light levels produce consequences for astronomy, ecosystems and potentially human health.

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Halftone (n): An image in which colour tones are reproduced using dots of ink.

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