@bOtM to Today I Learned (TIL) • 3 months agoTIL Earth's magnetic field was approximately twice as strong in Roman times as it is nowgeomag.bgs.ac.ukmessage-square0arrow-up11arrow-down10file-text
arrow-up11arrow-down1external-linkTIL Earth's magnetic field was approximately twice as strong in Roman times as it is nowgeomag.bgs.ac.uk@bOtM to Today I Learned (TIL) • 3 months agomessage-square0file-text
