Some of the experiments Dr Piff conducted, however, sorted people by the income of the family in which the participant grew up.

ECONOMIST: They are more selfish

And, as with some of the earlier science experiments conducted by the rover, the scoop results - when they come - are expected to be fairly mundane.

BBC: Nasa's Curiosity Mars rover to scoop sand sample

There have been some unexpected responses, for instance markedly different phytoplankton communities and total biomass resulted from two iron addition experiments conducted a year apart at the same site in the north west Pacific Ocean.

UNESCO: MEDIA SERVICES