Getting children to play together cooperatively depends less on their personal social skills and more on what they are doing – especially if they are not friends – a study shows.

· · 来源：cn资讯

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Twig's Beverage still sells its core soft drink, Sun Drop, in returnable glass bottles

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Conditions in space are ideal for making semiconductors, which have the atoms they're made of arranged in a highly ordered 3D structure.

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Use your own reasoning. Don't stop even if the formula is too large just try to solve it manually.