Researchers have discovered there was an anomaly in Earth's gravitational field between 2006 and 2008, potentially caused by a mineral shift deep within Earth's mantle...The large gravitational anomaly lasted for about two years over the eastern Atlantic Ocean. It peaked in January 2007, the same month Steve Jobs announced the first iPhone (though, of course, there was no connection between the two events).Researchers recently discovered the signal while analyzing data collected by the Gravity Recovery and Climate Experiment (GRACE) satellites between 2003 and 2015. The gravitational anomaly happened around the same time as a geomagnetic "jerk" -- an abrupt change...