        The first time he had come across them on the beach, one of the armored ones had been pointing its horn at him.  Now he knew why.  Obviously, the spears were ceremonial.  The armor was probably reflective, so that the beams or whatever shot from their horns would bounce off.  His mind began struggling back to everything he’d learned about physics.  Gravity was a weak force, if he remembered right.  Electromagnetism was a strong force, and could counter gravity.  There was something about entanglement, too. 