Here come the killer robots

If you think drone warfare has created some tricky moral dilemmas, said Robert H. Latiff and Patrick J. McCloskey, just wait until we start sending robotic soldiers into battle. Early prototypes of robots that can hunt down and destroy enemies with ferocious firepower are in development, and “what now seems like the stuff of Hollywood fantasy is moving toward realization.” […]

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How the moon was made

How the moon was made

People always wonder how the moon was made. The birth of the planets 4.5 billion years ago was extremely violent. They grew to full size by absorbing rival planet embryos in a series of titanic collisions—one of which probably gave Earth its moon (below). The moon’s large size, low density, and other features suggest that it emerged from an explosion […]

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