Or, by separating terms with a comma, you can compare the relative frequency of two terms. This one shows that 'doctor who' has been catching up with 'star trek' lately.
The laziest journalism is an article that says 'If you enter x into Google you get 15 million hits, showing how important it is...' blah blah. I expect we'll see more lazy journalists mining this rich seam for irony. I wonder when I'll first see this one in a newspaper?