Computers, laptops and portable displays have become an integral part of work, study and entertainment in the 21st century.

Discover the proper way to tie a timber hitch for safe and effective rope work, every time. #TimberHitch #KnotTutorial ...

Learn how to tie the Alpine Butterfly Loop — a strong, dependable knot for creating a fixed loop in the middle of a rope.

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

This essay is excerpted from a new Chronicle special report, “Leading in the AI Era,” available in the Chronicle Store.