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Ubuntu is a community developed, Linux-based operating system that is perfect for laptops, desktops and servers. It contains all the applications you need - a web browser, presentation, document and spreadsheet software, instant messaging and much more.

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Pretty cool trick to find the height of something. You just need to know how far away from the object you are.

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Good video for kids to see dolphins playing around.

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Earth at it best. Cool video with good sound.

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Wild stuff using water enriched with iron and a magnet.