Not to mention vats of rainbow-hued fish roe, dense black loaves stuffed with shoals of tiny fish, and the famous Finnish apple pie.

BBC: Postcard from Helsinki, Finland

The entire city of Fort Worth sits over a gas dense layer of black rock called the Barnett Shale that only recently became possible to access.

NPR: Drilling for Gas in Dallas-Fort Worth

Black holes are so dense that they do not even let light out.

WSJ: Matt Ridley on the Higgs Boson | Mind & Matter

Black holes are believed to be so dense that not even light can escape their gravitational pull once it crosses over its theoretical border, known as the event horizon.

CNN: Black holes in a new light

The sleek black interior is matched with pre-fitted, dense noise absorbing material on the side panels, efficiently absorbing noise and vibrations.

ENGADGET: Fractal Design's Define Mini custom PC case ditches LEDs for style

It was that pulsars are rotating neutron stars, the super-dense last stage of collapse of a star not quite heavy enough to form a black hole.

ECONOMIST: Obituary