he top U.S. commander in Afghanistan says in a new interview that he has not seen evidence to corroborate claims that Russian officials placed bounties on U.S. troops stationed in the Middle East.

cientific American has never endorsed a presidential candidate in its 175-year history. This year we are compelled to do so. We do not do this lightly. The evidence and the science show that Donald Trump has badly damaged the U.S. and its people-because he rejects evidence and science.