The News:
Magnetized rocks push back origin of earth's magnetic field. Earth's churning interior produced a protective magnetic field as early as 3.45 billion years ago, closer to when life began. Continued in Scientific American, March 4, 2010 by John Matson.
The Research:
Read the research by John Tarduno et al. behind this story in March , 2010 edition of Science, Vol. 327. no. 5970, pp. 1238 - 1240
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