Explain wbg they appear to have a correlation. What is going on? Does they been the two variables really are related?

Math doctorates awarded correlates with Uranium stored at US nuclear power plants 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2000 degrees 100 million pounds 1600 degrees 80 million pounds Uranium US power plants 1200 degrees 60 million pounds 800 degrees 40 million pounds 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 Uranium US power plants - Math doctorates tylervigen.com