* Astronomy

How lasers revealed a lost city

Deep in the Cambodian jungle lie the remains of a vast medieval city. Hidden for centuries, new archaeological techniques are now revealing its secrets - including an elaborate network of temples and boulevards, and sophisticated engineering.
In April 1858 a young French explorer, Henri Mouhot, sailed from London to south-east Asia. For the next three years he travelled widely, discovering exotic jungle insects that still bear his name.
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