How on Earth did we start using “once in a blue moon”?
The moon does turn "blue" sometimes, but this idiom doesn't really refer to its color.
Tag: Blue
Large ocean fish need ‘Blue Corridors’ to thrive — we now know where these should be established
Setting-up areas where these fish can migrate in peace would help these species remain healthy.
All blue eyes descend from a single common ancestor from 6- to 10,000 years ago
One big happy family!
Why is the ocean blue?
It's all due to the physics of the scattering of light.
Chameleons display fluorescent bones on the skull, study shows
Researchers discovered a new outstanding feature of the chameleon: its bones shine in a blue hue in UV light.
New, cheap artificial photosynthesis scrubs the air and produces fuel
Currently only works with blue light, but they're working on fixing that.