xkcd is “a webcomic of romance, sarcasm, math and language.” It is also very funny and at times ground-breaking – I recommend it as food for everyone’s inner nerd. I never thought that stick figures could be so cool!
I also recommend its companion site, what if?, which provides further sustenance by answering questions with physics. Questions such as:
Head on over to either and you will laugh or be enlightened. Perhaps even both.