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

The red numbers on a tape measure can have various purposes, from making the blade more legible to determining the distance ...

This nine-digit number identifies your bank or credit union in a financial transaction. Many, or all, of the products featured on this page are from our advertising partners who compensate us when you ...

Sarrah Shah has 11+ years of experience working in the financial industry. She began writing financial articles for Investopedia in 2015. Robert Kelly is managing director of XTS Energy LLC, and has ...

Amazon to close all UK grocery shops - but add meat and dairy to online store Amazon plans to close all of its Fresh grocery stores in the UK, putting up to 250 jobs at risk. The 19 shops will shut ...

This viral optical illusion hides an inverted 55 and a 53 among dozens of 35s. Can you spot them before time runs out, or ...

These days, iPhones can do a lot – and we mean a lot. From photography and video editing to gaming and artificial intelligence, it’s enough to make you forget they can also, you know, make phone calls ...

Wanna see a trick? Give us any topic and we can tie it back to the economy. At Planet Money, we explore the forces that shape our lives and bring you along for the ride. Don't just understand the ...

Using vague criteria and a low evidentiary standard, the government exercises virtually unfettered discretion and secrecy in making its No Fly List decisions. Claiming national security, the ...

Carla Tardi is a technical editor and digital content producer with 25+ years of experience at top-tier investment banks and money-management firms. The rational expectations theory is a concept and ...

Shape Tools is a collection of geodesic tools that are installed in the Vector menu, on the toolbar, in the field calculator, or in the Processing Toolbox. Geodesic is the shortest path between two ...