A federal judge on Tuesday permanently blocked Alabama from executing an inmate with nitrogen gas after declaring the method violates the ban on cruel and unusual punishment.U.S.

A federal appeals court says Alabama's use of nitrogen gas for executions needs more study to see if it violates the ...

While solar panels rely on sunshine and wind turbines depend on changing weather conditions, ...

A breakthrough hydrogen-production method could make clean fuel far cheaper and easier to generate. Researchers at the University of Birmingham developed a perovskite-based catalyst that splits water ...

A team of researchers led by Das and Matthias Beller of the Leibniz Institute for Catalysis designed a light-activated iron catalyst that plucks oxygen atoms from CO 2 at room temperature and uses ...