Lewis Dartnell descends a kilometer underground to visit a laboratory where scientists have spent twenty years searching for the elusive particles that hold our galaxy together.
![Down in the dark matter lab](https://i0.wp.com/staging.boingboing.net/wp-content/uploads/2014/09/Untitled4.jpg?fit=1&ssl=1&resize=600%2C4000)
Lewis Dartnell descends a kilometer underground to visit a laboratory where scientists have spent twenty years searching for the elusive particles that hold our galaxy together.