Would you spend 10 days on a waterbed for science? 🛌 What happens to the human body in space? To find out, 20 volunteers are taking part in Vivaldi III, a groundbreaking experiment in France. For 10 days, half of them/10 lay in special waterbeds, simulating the effects of weightlessness—helping scientists prepare astronauts for space missions! Participants lay in bathtub-like containers lined with waterproof fabric. This keeps them dry but fully supported by water, creating a floating effect similar to microgravity. Their muscles, bones, and fluids react in some cases much like they would in space! For 10 days, participants ate using floating boards, rested on neck pillows, and even took bathroom breaks while staying in a laid-back position. Scientists closely monitor their neurological, cardiovascular, and metabolic changes — just like researchers do with astronauts! Another group spent 10 days in head-down bed rest, which mimics fluid shifts and muscle loss in space. Comparing ...