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TIL Earth's magnetic field was approximately twice as strong in Roman times as it is now

https://geomag.bgs.ac.uk/education/reversals.html
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1g004mf/til_earths_magnetic_field_was_approximately_twice/
#TIL #todayilearned
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