Today on ¿ìè¶ÌÊÓÆµ All the latest on newscientist.com: tools to spot aliens, data trackers that nudge you, Twitter revelations, solving a big magnetic mystery and more Regulars
Micro-ratchet spins pearls with perfect symmetry It took humans hundreds of thousands of years to invent the wheel, but molluscs have been turning out flawless spheres for hundreds of millions of years. ¿ìè¶ÌÊÓÆµ