Almost everyone has a shelf, a windowsill, or an old shoebox quietly filling up with stones, shells, sea glass, or fossils they couldn't leave behind. This week we look at the deeply human urge to pick things up off the ground and carry them home — where it comes from, what it means, and why a pebble from a particular beach can somehow hold an entire afternoon. No gemology degree required; just a magpie heart and a tolerance for sand in your coat pockets.