a prism
you have to input the same direction anywhere twice
True.
No, they sum up to twice one of the forces.
No. There is nobody by the name of Pierce Bronson.
The same as your own nipples: she likes to be petted there!
The same way you make a guy's nipples hard.
Yes grow
yes
your horizon
Yes, in which case the resulting vector is twice the length of the original, pointing in the same direction.
Cats usually have eight nipples but sometimes there can be extra ones