What a new DOJ memo could mean for naturalized U.S. citizens Scientists discover 3,500-year-old lost city in Peru that ...

Why is Mars barren and uninhabitable, while life has always thrived here on our relatively similar planet Earth?

The European Space Agency (ESA) has revealed an ambitious plan to establish human settlements on Mars within 15 years. ESA's ...

Such a high-rise farm has not yet been built. But in Devon, England, the Paignton Zoo has maintained a hydroponic, controlled-irrigation garden for several months.