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

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