In 1852, botanist Francis Guthrie noticed something peculiar as he was coloring a map of counties in England. Despite the counties’ meandering shapes and varied configurations, four colors were all he ...

I have a Sharp 32J-S400 32" TV and it's about 4 years old. Recently, the colors in the bottom left corner of the TV (a 2" quarter circle extending directly from the corner) have been off. <P>If that ...

As an undergraduate at the University of Chile, Bernardo Subercaseaux took a dim view of using computers to do math. It seemed antithetical to real intellectual discovery. “There’s some instinct or ...

I spent a great deal of time trying to track down this problem’s cause and solution, and in the process learned tons of things I never imagined I’d need to know about color profiles, browser ...

Graph reconfiguration and colouring problems investigate the transition between feasible solutions of a graph colouring instance. The central challenge is to determine a series of elementary vertex ...

Have you ever tried to do the brainteaser below, where you have to connect the dots to make the outline of a house in one continuous stroke without going back over your lines? Or perhaps you've ...

56% of those of you who color say, "My hair used to be healthy. Now it's…not." Heal it at home. Dyeing your 'do can parch hair (like heat styling does), so its bounce and shine can be hard to hold on ...

All the Latest Game Footage and Images from Npc Problems: Vertex Coloring In the world, there are some problems that cannot be solved by today's computers. Being necessary the use of artificial ...

Embed <iframe src="https://www.npr.org/player/embed/4254287/4254288" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player"> NPR's ...