Have you ever noticed how blue in nature feels rare and almost magical? You can see the endless sky and deep oceans painted in blue, yet when you look at plants, animals, or rocks, the colour is ...

Indonesia’s Kawah Ijen volcano appears to glow electric blue at night, but the colour does not come from lava. Instead, ...

When you take the sky and the ocean out of the equation, blue is surprisingly rare in nature. Less than one in ten plants have blue flowers, and it isn't common in animals, either. One reason is that ...