If Elon Musk is to colonise Mars, he’ll need to recruit a crew of genetically-modified humans

People who live on Mars may need to be genetically altered to be resistant to radiation. And while it might seem a long way off, research is already underway to work out how this can be done.
Read more: http://www.wired.co.uk/article/elon-musk-mars-colony-spacex-radiation-genetically-modified-humans?source=Snapzu