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Earth's magnetic field surrounds us like a powerful, invisible protective shield. It ensures that migrating birds find their way, compass needles show the correct direction and satellites send data undisturbed by space weather. Without the magnetic field, life on earth would not even be possible. In her reader, science journalist Anke Wilde dives deep into the hidden world between sky and earth. Very casually she explores the question “what keeps the world together at its outer edges”: technically in-depth, often surprising and in a uniquely entertaining manner.