Right now, there are 28 mega-cities in the world, with about 450 million inhabitants among them. So, which world cities make the cut?
The city, which contains flat-topped pyramids, was in use between roughly 600 B.C. and 300 B.C., when the first cities were being constructed in the area.
An international team of researchers has figured out which cities squander the most resources, and which are the most efficient.
Urban birds have adapted to city living by building their nests on everything from barbecue grills to urinals.
A new report places Singapore at the top of a pricey list: the costliest place in the world to live.
Pollution and the urban heat island effect may cause slightly more thunder and lightning than rural areas get. Continue reading →
Autonomous vehicles avoid collisions by scanning their environment 25 times per second Continue reading →
An underwater eco-city is designed for deep-sea living.
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