What explanation would you give to a friend who has recently had a kidney transplantation but can’t believe it when a nurse told him that his old kidneys were left in place?

Where are the choices?

Agroup of engineering students from purdue university reported that its licking machine, modeled after a human tongue, took an average of 364 licks to get to the center of a tootsie pop. twenty of the group's volunteers assumed the licking challenge-unassisted by machinery-and averaged 252 licks each to the center.