As many people sit at the wheel of their car, they are certain they know what color is. It's the red traffic light in front of them, the garish yellow hatchback in the next lane, or the green verge ...

What color is a tree, or the sky, or a sunset? At first glance, the answers seem obvious. But it turns out there is plenty of variation in how people see the world—both between individuals and between ...

From astrological signs to flowers, there are many identifiers for someone's birth month. But there is none quite as beautiful or valuable as the birthstone. Each month has its own gemstone which ...

White light can be blinding, cold, unforgiving. Our physical reality often finds it too much as well, splitting it apart any chance it gets. Plants are green because such wavelengths of light help it ...