Gravity-defying sand: Researchers discover uphill flow phenomenon

Researchers at Lehigh University have discovered that sand can flow uphill when subjected to torque and an attractive force. By applying these forces to each grain, the sand particles were observed to flow uphill, up walls, and up and down stairs. This unusual discovery could have various applications in fields such as healthcare, material transport, and agriculture. The researchers are now exploring the collective motion of the sand particles and investigating potential uses in microrobotics and nutrient delivery systems.