P-1 is the second exoplanet that is much bigger and less dense than theory predicts.

ECONOMIST: Planetary science: When a world is born | The

The eggs float because their interior is less dense than the surrounding sea.

ECONOMIST: Fish genetics

Aluminum, being less dense than steel, has greater sound radiation, and yet the alloy-bodied SL summons a lush, refined quiet in the cabin to rival a fixed-roof car.

WSJ: 2013 Mercedes-Benz SL550 Review: The Beauty Is All on the Inside | Rumble Seat by Dan Neil

You have to be canny to catch big fish here there are fewer of them, they see many more anglers and the hatches are generally less dense than they are out west.

FORBES: Catskills Fly Fishing Book

Produced by Spoon's Britt Daniel, It's Frightening is more musically assured and less sonically dense than White Rabbits' debut, Fort Nightly.

NPR: White Rabbits: Something Novel

"We know that women who have given birth have more lucent (less dense) breasts than childless women, " he said.

BBC: Breast cancer 'is harder to spot'

They also have to compete less fiercely for resources than trees in dense forests.

ECONOMIST: The 17-year cicadas are about to emerge in force

City dwellers tend to walk more and drive less than their suburban counterparts, and dense urban development encourages transit use.

WSJ: How to Build a Greener City

It depends on a recent body of work which suggests that the brain's white matter (the wiring that connects the main bodies of the nerve cells, or grey matter, together) is less dense and less abundant in the brain of an autistic person than in that of a non-autist.

ECONOMIST: Autism