Charlie and Phil playing with “magic” sand at a local science fair. The sand repels water and teaches kids about the difference between hydrophobic and hydrophilic materials.- Charles Crowe, PSU, U.S.
Charlie and Phil playing with “magic” sand at a local science fair. The sand repels water and teaches kids about the difference between hydrophobic and hydrophilic materials.- Charles Crowe, PSU, U.S.