Chris and Doran are joined by Mark Weislogel to discuss his work over the years, neatly summarized in the paper, "How advances in low-g plumbing enable space exploration", published in npj Microgravity, 2022, 8, 16. The article can be found here: https://doi.org/10.1038/s41526-022-00201-y About Mark: Mark was a professor of mechanical engineering for over 20 years, before moving to work full time at IRPI, a company that develops technology solutions for plumbing in low gravity. He also invented that cup. Introduction preamble: Dale Cooper.