One of the biggest dangers of interplanetary travel is radiation exposure. In a single round trip to Mars, for instance, you may absorb 60 percent of the maximum recommend lifetime dosage. One surprising solution may be mold, according to researchers from Stanford and North Carolina universities. They discovered that fungus thriving in the nuclear fallout of Chernobyl blocked radiation on the international space station (ISS), and could be adapted for trips to the Moon and Mars.