Because it opposes the attractive force of gravity, dark energy tends to inhibit cluster formation.

ECONOMIST: Cosmology

And dark energy may turn out to be almost the mirror opposite of gravity - a repulsive rather than an attractive force, and one that strengthens with distance rather than weakening.

BBC: Getting the measure of dark energy

Mr Chanda makes a solid and attractive case for globalisation and its potential as a force for good.

ECONOMIST: Globalisation

The flurry of dealmaking coincides with a new pricing system, which went into force on April 1st and makes it more attractive to sell new drugs.

ECONOMIST: Japan's drug firms on the move: A homespun elixir | The

Aside from its rapid growth, the company has another attractive aspect for shareholders: low costs, achieved through a largely foreign labor force and taking advantage of offshore tax incorporations.

WSJ: Ocwen's Rapid Growth Puts Spotlight on Its Practices

While they may seem attractive theories on the surface, on closer inspection the research team found they could not be the driving force in the evolution of the lion's social lifestyle.

BBC: Lions breed better if living near joining rivers