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The Flyspeck project is complete: we know how to stack balls!

From Wikimedia Commons; Rendered by Blotwell using POV-Ray and converted with Adobe ImageReady.A team led by Thomas Hales has announced a formal proof of the Kepler conjecture – one of the oldest problems in geometry – which states that no packing of equally sized spheres in 3-dimensional space is more efficient than the face-centred cubic packing (pictured right), or hexagonal close packing.