The modern periodic table, arranged in rows and columns, was first introduced by Dmitri Mendeleev in 1869. At the time, it included the known elements and their properties, but Mendeleev predicted ...

Newly captured satellite imagery shows Russia appearing to evacuate military equipment from a key naval base in Syria. The images are the latest sign that Moscow is scaling down its footprint in ...

In his first remarks as President Donald Trump’s defense secretary, Pete Hegseth referred to two U.S. military bases by their former Confederate names, appearing to hint that he might possibly restore ...