Pesticides and cancer drugs are both created by:
selective breeding
hybridization
recombinant DNA
cloning

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

prndulum needs thread, weight clock to time swings