To be well informed (and clever!!!),
What Ancient African Huts Reveal About Earth's Magnetic Flips. Minerals in clays from the Iron Age may help scientists better understand how and why the magnetic poles swap places.
https://news.nationalgeographic.com/2018/03/earth-magnetic-field-south-atlantic-anomaly-africa-science/?utm_source=NatGeocom&utm_medium=Email&utm_content=inside_20180402&utm_campaign=Content&utm_rd=1551684491
(font: National Geography/https://www.nationalgeographic.com/. Acess: April 02, 2018)
