Math puzzle: The homesick rover

Far away, on a large, rocky exoplanet, a rover from Earth has just arrived on a mission of exploration. But the poor thing doesn’t want to explore. The moment it begins moving, it grows homesick and wants nothing more than to return to the very spot where it began. Unfortunately, it has received very explicit…

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In Venezuela, Big Oil Collides with a Hotter Planet

Kendra Pierre-Louis: For Scientific American’s Science Quickly, I’m Kendra Pierre-Louis, in for Rachel Feltman. Over the past couple of weeks oil—specifically, Venezuelan oil—has been all over the headlines. It started late on January 2, when President Donald Trump ordered U.S. military forces to enter Venezuela and capture the country’s president, Nicolás Maduro, which they did…

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