China's air pollution has reached new heights, with smog so thick that it is visible from space.

     





One liter of seawater contains, on average, 13 billionths of a gram of gold.

     





Two minutes is the amount of time a human being can survive in space unprotected.

     





A cat uses its whiskers to determine if a space is too small to squeeze through.

     





The word shark is derived from the Latin word meaning 'sharp teeth'.

     





The width of your arm span stretched out is about the length of your whole body.

     





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