"I think this photo wins the futile advertising of the month award. The bus stop is round the corner from Nature‘s Kings Cross, London offices in Caledonian Road. Apart from the Nature team (who already subscribe to Science) there can be no potential readers of this excellent but very high-level journal at this bus stop. The poster is there (at significant expense) presumably simply to irritate the Nature team (I can think of no other explanation). What it does suggest is that ‘not-for-profit’ publishers (Science is owned by the learned society, AAAS) can be more liberal with their subscribers’ money than privately-owned ones."
Disclaimer: I work for Nature, and Richard Charkin is CEO of Macmillan publishers, owners of Nature.