Citizens of Argentina’s capital city, Buenos Aires, were recently treated to an alien sight along its beach shore: a blanket of thousands of pearly orbs strewn about the sand. The orbs, it turns out, ...

Snails have shells the moment they're born, but it's kind of hard to tell. In fact, it's hard to even see a baby snail. Some are nearly microscopic, such as Angustopila psammion, whose adult-sized ...