Tyler Cowen flags a Ben Casnocha post on the subject:
There are some remarkable contrasts between "dumb" searches and "smart" ones. People who start their search "how 2" are more likely to search "how 2 get pregnant" or "how 2 grow weed." People who start their search "how one might" are more likely to search "how one might discover a new piece of music" or "how one might for the rise of andrew jackson in 1828."