We all know Mars is called “The Red Planet,” but have you ever stopped to wonder—why is it red? The classic joke explanation has been, “It’s rusty.” While that’s not entirely wrong, the truth is far ...

Earth's oceans may have displayed a very different color several billion years ago. This hypothesis emerges from a recent ...

The first life forms used retinal instead of chlorophyll, absorbing green light and reflecting red and blue—turning the planet an eerie purple. Chlorophyll wasn’t always king. Retinal ...

Color is an indicator of great importance in the general balance of nature, it is a concrete visual message that tells everything about the element it represents ...

Printable Earth Day bookmarks are a fun way to celebrate the planet and encourage kids to read at the same time. These Earth Day printable activities work well at home or in the classroom, giving kids ...