From the sky to the sea, there are several things on Earth that we all know to be blue. During the test, you'll be shown a series of six shades and asked to click on one of two buttons – 'This is blue', or 'This is green'. At the end of the test, you'll be shown where your blue-green boundary …
The latest headlines from our reporters across the US sent straight to your inbox each weekday Your briefing on the latest headlines from across the US Your briefing on the latest headlines from across the US SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our privacy policy Teton County Coroner Brent …