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Cracks on Europa sport traces of ammonia

The search for life-supporting worlds in the solar system includes the Jovian moon Europa. Yes, it's an iceberg of a world, but underneath its frozen exterior lies a deep, salty ocean and a nickel-iron core. It's heated by tidal flexing, and that puts pressure on the interior

The 6 separations of power, and why they all matter

As the 250th anniversary of our independence approaches, let us linger over the most important sentence that James Madison ever wrote, and the most relevant to the current moment. “The accumulation of all powers legislative, executive and judiciary in the same hands,” he wrote,