When you've had a hectic day and are ready to kick back and relax with your favorite smokable, the last thing you need is the added stress and mess of rolling your own. Convenient pre-rolled cones are ...

Color blindness is usually an inherited condition that makes it difficult to differentiate among shades of colors. Color blindness, or color deficiency, happens when the cones of the eye are missing ...

Evolution mostly involves small, gradual changes, and for good reason – we might expect that large changes to an animal’s genetic code, and therefore to its body plan, simply wouldn’t work. It would ...

Female (left) and male spruce cones at the Arnold Arboretum. It's a more common sight to see separate male and female cones like this. (Courtesy William "Ned" Friedman) Every spring the conifer trees ...

There are three main types of color vision deficiency: red-green, blue-yellow, and complete. Color blindness, or color vision deficiency, affects the way you perceive color and can make it hard to ...

Color blindness, or color vision deficiency, causes a person to see colors differently from most other people. There are several types of color blindness. Color vision deficiency or loss has multiple ...