Cartoonist Zach Weinersmith and his wife Kelly, a parasitologist, publish 'A City on Mars', where they mock Elon Musk's technoutopianism and provide data to doubt that space colonization is just ...

Let's say you've picked the perfect spot for building a settlement on Mars. But this opens up some pretty nasty questions. Building…what? And building….with what? There are no trees to chop down to ...