Humans on Mars could conduct far better science than any machine 

 NASA's moon-to-Mars strategy identifies science as one of three pillars upon which the agency's quest for a sustained human presence throughout the solar system is built. 

https://cdn.mos.cms.futurecdn.net/GxHsQh68LifyoS4BPVqJ4E.jpg

https://www.space.com/humans-on-mars-better-science-machine