When white light strikes a blue feather, the keratin pattern causes red and yellow wavelengths to cancel each other out, while blue wavelengths of light reinforce and amplify one another and ...

A strange blue spiral lit up the skies over Europe on ... along with requests to identify this weird light. Some users even speculated that the spiral could be the work of aliens!

Blue indoor plants? They do exist and will complement any interior with shades of blue foliage or blossoms. There may be more blue houseplants than you realize.