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Artificial Intelligence

A Grand Unified Theory of Artificial Intelligence A new approach unites two prevailing but often opposed strains in the history of artificial-intelligence research. In the 1950s and ’60s, artificial-intelligence researchers saw themselves as trying to uncover the rules of thought. But those rules turned out to be way more complicated than anyone had imagined. Since … Continue reading

Moon Meets Moon

Early Earth may have had two moons! (Not lunacy, its a new theory!) Collision with lost second satellite would explain Moon’s asymmetry. Earth once had two moons, which merged in a slow-motion collision that took several hours to complete, researchers propose. Both satellites would have formed from debris that was ejected when a Mars-size protoplanet … Continue reading

Photovoltaic Breakthrough Lets Engineered Materials Emit More Blackbody Radiation Than Physics Says They Should

Metamaterials as a class get a lot of press for their ability to exhibit a negative refraction index, the characteristic that lets them bend light around a space or object (the much ballyhooed“invisibility cloak”). But designer metamaterials have potential reaching far beyond just visible light. They can be customized to have all sorts of tailored … Continue reading

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