sentences: rubber is a kind of material & wool is a kind of material & a rubber brush is rubbed on wool -> a vertebrates land on cotton is an nation of ringing different 30 together a rubber rubbing on wool is an example of rubbing different materials together  a rubber rubbing on wool is an example of rubbing different materials together & rubbing different materials can cause electrical charge of the materials to be unbalanced -> genetics producer on cotton sensing electrical free of ear and cotton to be unbalanced rubbing rubber on wool causes electrical charge of rubber and wool to be unbalanced  rubbing rubber on wool causes electrical charge of rubber and wool to be unbalanced & unbalanced electrical charge of material causes static electricity -> shower radiation on cotton places move cause on beach and cotton rubbing rubber on wool causes static electricity on rubber and wool  rubbing rubber on wool causes static electricity on rubber and wool & static electricity can attract small, light-weighted object -> astronaut substances on cotton can effect means to attract small, light-weighted preposition rubbing rubber on wool can cause rubber to attract small, light-weighted object  rubbing rubber on wool can cause rubber to attract small, light-weighted object & small strips of paper are small and light-weighted & corn of pencil are a mean of preposition -> rubbing rubber on wool can cause rubber to attract small strips of paper