TechnologyNew blues: The quest to make the world’s rarest colourNatural blue pigments to colour paints, inks and plastics are so hard to find that people will go to the depths of Earth to discover new onesFeatures
EarthHuge space rocks could have helped start Earth’s plate tectonics Nobody knows how or why plate tectonics got started on Earth. But new evidence suggest collisions with space rocks millions of years ago may have something to do with it 51¶¯Âþ