Over the past three decades, humanity has been sending rovers to explore our planetary neighbor, Mars. The first Mars rover, the Sojourner Rover, landed July 4, 1997. Since then, the United States has landed four more rovers on Mars. 

 One day you might live in a 3D printed home. When you think of 3D printing, you might envision a small robot printing plastic, but some companies have graduated to 3D printing houses. They deposit concrete similarly to a traditional fused deposition modeling (FDM) printer. They deposit concrete onto a foundation in layers until they have completed walls.