/tags/civilization civilization en-US SA¹ú¼Ê´«Ä± Tue, 14 Feb 2017 16:00:00 GMT /2017-02-14/iron-age-potters-carefully-recorded-earths-magnetic-field-by-accident The planet's magnetic field is weakening. Scientists aren't sure why, but studying ancient jars could help them find out. The ceramics provide a remarkable window onto Earth's magnetic past. Tue, 14 Feb 2017 16:00:00 GMT /2017-02-14/iron-age-potters-carefully-recorded-earths-magnetic-field-by-accident Rae Ellen Bichell /show/topical-currents/2013-09-04/immigration-civilization-and-america 09/04/13 - Wednesday’s Topical Currents is with policy expert and Senior Fellow Alvaro Llosa, author of GLOBAL CROSSINGS: Immigration, Civilization, and… Wed, 04 Sep 2013 17:00:00 GMT /show/topical-currents/2013-09-04/immigration-civilization-and-america Joseph Cooper