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

Paul Sutter is an astrophysicist at The Ohio State University and the chief scientist at COSI Science Center. Sutter is also host of the podcasts Ask a Spaceman and RealSpace, and the YouTube series ...

The driveshaft is an often overlooked, yet critically important component of a vehicle's drivetrain. Not only must it be strong enough to contend with the engine's output but it must also operate ...

The pupillary distance (PD) measurement is a requirement for people who want to purchase eyeglasses. Here, find out how to measure your PD using a mirror and a ruler. Share on Pinterest Some eyewear ...