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When the Earth Had Two Moons
A new model—“The Big Splat”—explains the strange asymmetry of the moon.
The Disappearing Physicist and His Elusive Particle
He ushered symmetry into theoretical physics, then vanished without a trace.
The Sacred, Spherical Cows of Physics
Theoretical physics milks symmetry to power its newest tool.
The Gaia Hypothesis Is Still Giving Us Feedback
Revisiting James Lovelock’s theory as it approaches 50.
