Fossilization is a tricky business; some species preserve only a few bones, while others are discovered with a one-in-a-billion level of completeness. Most would count themselves lucky to find a ...

Billions of years ago, our planet did not have the deep blue oceans we admire today. Instead, they were actually […] ...

which meant it would have given the ocean water a green hue because iron hydroxide absorbs blue light and water absorbs red light—leaving green light to be reflected back into the atmosphere.