If you own a phone, a television, a radio or a tablet computer, you really need to understand spectrum. Companies like AT&T, T-Mobile, Sprint and Verizon want to get access to as much of the spectrum as they possibly can in order to build networks, get customers and make money. That effort to acquire spectrum was at the heart of the failed acquisition of T-Mobile by AT&T. And it’s at the heart of a proposed deal between Verizon and a consortium of cable companies. Also, IKEA releases a series of web videos, complete with sing-alongs.