Grim.Punching BagNASA is undergoing another round of layoffs. And once again, it’s the space agency’s famous Jet Propulsion Laboratory in California that’s taking the hit.On Tuesday, JPL announced that it will be saying goodbye to 325 employees, or about five percent of its workforce, marking the second time this year that the research lab has downsized its personnel.”This is a message I had hoped not to have to write,” JPL director Laurie Leshin wrote in a memo to employees. “With lower budgets and based on the forecasted work ahead, we…