Each metro line usually has its own color on the map. For obvious reasons, these colors should be maximally different. Suppose a new metro line is built. We now explain a strategy to choose the color ...

New England may get the rave reviews, but California has the ecology, topography and the landscapes, according to California Fall Color editor Lara Kaylor. She notes that California is unique among ...

Some cultural debates are lodged into our collective consciousness: Beatles versus Stones, “Star Trek” versus “Star Wars,” Coca-Cola versus Pepsi. For New York City transit buffs, it's about which ...

See how to use the R leaflet package to color-code a map by winner, loser, and margin of victory. If you’re mapping election results of, say, the US presidential election by state, it can make sense ...

Source: Wikimedia Commons / Frederic Edwin Church / 1866. Fine Arts Museums of San Francisco How many colors are in the rainbow? Seven said Sir Isaac Newton. Of course, Newton knew that a spectrum is ...