Benny wonders why when he presses his fingers aganist a map nothing happens to the map. However, if he presses a thumbtack into the map using the sam force , the track will probably poke a hole in the map. This is what his friends said was the reason a. I think its because the tack is made of metal
b. I think its beacuse your finger has more surface
c. I think its because your finger is warm.