I expect that within five years we will all have the option of a smart, always available, personal assistant. A good model ...

On June 30, 1908, a catastrophic explosion rocked the skies over Eastern Siberia, releasing an energy equivalent to 10–15 megatons of TNT. Known as the Tunguska event, this mysterious occurrence ...

From Africa to Asia, countries are already fighting over rivers, dams, and access to freshwater. As the world faces growing ...

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