Regions which meet at a single point are not considered to be "adjacent". After examining a wide variety of different planar graphs, one discovers the apparent fact that every graph, regardless of size or complexity, can be colored with just four distinct colors. This "four-color conjecture" was first noted by August Ferdinand Mobius in 1840.
Jun 28, 2016 · Allene Anderson said her foster dog, Wrigley, a golden retriever, quaked for hours after a storm. Credit Whitten Sabbatini for The New York Times It is entirely possible that no one dreads the dog days of summer more than dogs themselves.