Mars explorers will be taking a limited amount of resources with them. This means they’ll need to “live off the land,” making structures from locally sourced materials. A new paper examines 11 different ways to make concrete/cement on Mars, from traditional lime concrete to more exotic materials that might only be possible on a cold, nearly airless world. They found that sulfur concrete is the most promising, offering strength, quick hardening, and it doesn’t need water.