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New discoveries have focused researchers on two possible migration routes
Five steps, reflected in the maps below, could be taken to help feed the large population predicted for 2050 as well as reduce the sizeable harm agriculture imposes
What was once called the Freedom Tower should soon become the tallest building in the U.S. It will also be among the best prepared in the nation for a terrorist attack or other emergency...
A look at how much the U.S. has spent through Homeland Security since 9/11 and what the government spends on preventing deaths through public health
Ten years later, what exactly residents and rescue workers were exposed to remains at least a partial mystery
Municipalities worldwide are introducing a host of creative solutions to reduce energy consumption, water use, waste and emissions, while also making it easier for people to get around...
A tour of the world's tallest buildings, including those under construction.
The people of cities such as Lagos are forging the world's urban futuremessily, scrappily, but with do-it-yourself energy and entrepreneurial verve
Data from hundreds of U.S. cities show that, on average, larger cities produce more wealth and innovation per capita than smaller ones do