SUPPOSE WE DRAW A LINE ON EARTH SURFACE,IT IS CALLED STRAIGHT LINE,,BUT MY QUESTION IS EARTH IS ROUND SO WHEN WE DRAW THE STRAIGHT LINE ,IS THAT LINE CALLED STRAIGHT OR CURVED? IF CURVED THEN WE HAVE...
Does liquid mercury occur naturally? Reason for asking is the story of the Chinese emperor, Qín Shǐ Huáng Dì, supposedly having in his tomb a river of flowing mercury on a model...