Science News: A report given at the American Geophysical Union meeting in Toronto, Canada last week suggests that scientists have discovered a way to measure the Earth's magnetic field from 1000 years ago.Geophysicist Annick Chauvin from the University of Rennes, France, and her colleagues have analyzed samples of bricks and mortar from 9th and 10th century French buildings.They suggest that the Earth's magnetic field at the buildings locations peaked in 840 A.D. and measured about 70 microtesla, compared to 48 microtesla for the present day. Related Link Archaeomagnetic Study performed on Early Medieval Buildings from western France
