You might think that explaining why the sky is blue would be kind of simple. But even a brief explanation of it requires a lot of science. The colors of everything you see are produced in different ...

More than 5,000 years ago, in ancient Egypt, a mixture of silica, lime, copper, and an alkali was heated, resulting in a bright blue compound known as calcium copper silicate. This striking, vibrant ...

Browse 40,900+ 60s retro background stock illustrations and vector graphics available royalty-free, or start a new search to explore more great stock images and vector art. Vector illustration of the ...

Abstract Geometric Landscapes with Sunset,Sunrise and Waves in Orange and Blue Gtadient Colors. Retro Groovy Seventies Wall Decor. Vector Illustration. Flat Minimalist Design. 70s retro background ...