Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

Physicists show knotted cosmic strings may have dominated the early universe before collapsing to create matter—a theory ...

Here is your 2025 hard rock + metal album release calendar and all of this week's newest albums! Each week is loaded with new rock and metal releases and keeping track of it all can be pretty ...