Dec 12, 2016 | Sea Rescue
When people hear the word “drone,” they usually immediately think of a toy with a camera meant for an adult child or a military device capable of mass destruction. They do not realize the immense amount of applications that fall between these two extremes....
Dec 11, 2016 | City Walls
The prosperous 16th century city of Cartagena, Colombia fortified itself against pirates and invaders with a wall surrounding the city. Today, that wall is a UNESCO-protected heritage site and important tourist destination in the city. Due to increases in acid rain,...
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