Shadows are formed when opaque objects block the light. This picture also shows that the image is a proportionate representation of the object because light 'travels in a straight line'. The picture was taken when the sun was setting in summer time but the same conditions can be met earlier in winter time. Sent by Jay Hurry.

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Nice display of sources of energy at the Cardiff Bay Barrage.

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Boat made entirely of recycled materials shows sustainable living/development. The base is made out of used wooden barrels. It has then been layered with planks of wood with second hand wooden chairs nailed into place. Can also link with biodegradable and non-biodegradable materials. Via @BananaVsBrain

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Can you see Fibonacci here? Via @MaryUYSEG

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Use ideas about colour and light to explain the shadows in a hotel bathroom. Via @MaryUYSEG

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Did stone age people use pulleys and levers to raise Stonehenge? A class project perhaps? Via @DrDav

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Some great #scienceinmyhols tonight - flame tests on the camp fire! You can buy little packs of chemicals specifically designed for chucking in fires! Assume they have some Cu, K etc compounds in. We also had some painted pallets which produced coloured flames too. Provoked good chem discussion from non-scientists & kids. Via @MrsDrSarah

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Reflections at Baddesley Clinton of the moated manor. Via @sarahwhiuk

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Squirrel eating a nut on a tree branch. What features make it adapted to living in woods?

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Why is this plane famous? Via @Ange_K1

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