Kind of charge the rubber rod acquire

Summarize the mini-experiments that you see in the video made by Professor V. Sergan - posted on Canvas: https://www.youtube.com/watch?v=JOnYVEV0csk&feature=youtu.be What kind of charge does the rubber rod acquire when you rub it with wool? Why? What happens when you bring the second rubber rod in? What kind of charge does the glass rod acquire when you rub it with silk? What happens when a charged rubber rod and a charged glass rod are in the near vicinity of each other? What happens when two charged glass rods are in the near vicinity of each other? What does this experiment tell you about the existence of two different types of charge and of the interactions between like charges and unlike charges? Does a charged rod have any effect on a neutral rod suspended from a stirrup? Explain why or why not. Does a charged rod have any effect on a piece of aluminum foil suspended from a stirrup? Explain why or why not. How could this have happened if the foil was neutral in the beginning and not touched with the charged object?