Hello! Today I finally got my first iMac. And I just have one question about activity monitor . When I open Activity Monitor and go Window > CPU Usage I get this little window. It looks like it is showing me how much of each core is being used but it is a quad core and there is 8 little rectangles. Can someone please explain it to me I have the 4 Ghz Quad Core i7 late 2015. All help is appreciated.