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

Whether you’re a DIYer installing crown molding, a woodworker tackling tricky angles on a custom bookshelf, or a contractor ...

Superconductors are like the express trains in a metro system. Any electricity that "boards" a superconducting material can ...

Our phones are all-in-one solutions for managing our personal lives, so can they also replace a bag of tools? We decided to ...

With more than a decade of experience, Nelson covers Apple and Google and writes about iPhone and Android features, privacy and security settings, and more. As the holidays approach, millions of ...

ABC News’ Devin Dwyer reports on the upcoming Supreme Court ruling on affirmative action, and what has driven Justices Clarence Thomas and Sonia Sotomayor to be on opposite sides on ending the policy.