He had this extraordinary ability: he was both an inspiring person and he understood the way to turn people on to science was practical work, and he did that excellently.

It's true that as people in developing nations move from the countryside to the city, the shift may reduce the pressure on land, which could, in turn, be good for the environment.

Forty years ago people used to flock to the cinema, but now far more people sit at home and turn on the TV to watch a programme that is being channelled into millions of homes.