When a commercially owned Space-X rocket launches Sunday, aimed for the International Space Station, Portland State University engineering students will be watching. They’re sending a payload of experiments to ISS, hoping to learn more about how liquids react when gravity is gone. Doctor Mark Weislogel says it's a unique and fascinating learning experience. This is the 50th round of PSU projects headed for the Space Station.  In past experiments with NASA, the students have interacted with astronauts who help the students perform their tests.