So you land on an alien world teeming with life, determined to build a colony. It’s a struggle—which you expected. What you didn’t expect was to find yourself in an uneasy alliance with a bamboo-like plant covering a good chunk of your area. And as your descendants grow up and expand, this alliance deepens into a mutualism that is reassuring for some and concerning for others. That’s the fascinating proposition at the heart of Semiosis…