I had to look up who Carl Icahn is (http://en.wikipedia.org/wiki/Carl_Icahn); http://en.wikipedia.org/wiki/Carl_Icahn); he's a large-scale investor which is why

I had to look up who Carl Icahn is (http://en.wikipedia.org/wiki/Carl_Icahn); http://en.wikipedia.org/wiki/Carl_Icahn); he's a large-scale investor which is why the quoted tweet about plans to invest further in Apple caused Apple's stock to become more valuable.