Stingrays give birth to live babies, but they aren't mammals. Learn all about these fascinating fish that live in oceans and ...

And one of those big ideas was looking at how our world functions: Where does the energy come from that keeps most living ...

The science is unsettled, but researchers say there is cause for concern. Tiny plastic particles like these—called microplastics—are added to some exfoliating skincare gels and can get into the ...

The Iranian middle class, long a force of political moderation, stability, economic growth, and the base of the country’s reform movement, is shrinking fast under the pressure of Western sanctions, ...