Everyone knows that red means danger, but how did purple become a cautionary color? At an EPA conference in the late 1990s, attendees nearly came to blows over color coding on the Air Quality Index.

Learn more about the colorful and shiny stones that were turned into tools as many as 40,000 years ago, which were sometimes sourced from afar.

NPR's Neda Ulaby tells us how purple came to be a scarier color than red. NEDA ULABY, BYLINE: Red is the traditional color of danger, of stop signs, of warnings.

Michael Madden’s “Red Jasper” is a romantic and hopeful story that doesn’t wallow in sentimental melodrama. The characters find connection quickly and develop a tight bond at warp-speed.