What does tying the arm around the elbow do? ?

I'm going to assume that you are referring to a cord or piece of elastic band to cut circulation. Cutting off or reducing the venous return system which runs towards the heart, will cause the veins to become engorged with blood. These enlarged veins are easier to locate and stick with a hypodermic needle.

Think it's rice because in many countries rice is the main food so it can be traditionally served all at once.

Bisexual is when you like boys and girls.i hope that