1.   Matilda rubbed her palm against it and a white powder came off on to her skin.

2.   Ground crews were also exposed by rubbing the palms of their hands over the surface of aircraft contaminated with radiation.

3.   He rubbed the palms of his sweaty hands.

4.   Lewis vacillated from being calm and engaging to appearing nervous and angry, at one point vigorously rubbing his palms on the arms of his chair.