There is an old joke that goes something like this: One morning a polar bear cub is awakened by his parents so early in the day that the sky is still dark.
"Get up, get up," say the parents. "Today you learn to swim."
So the polar bear cub spends his day going in and out of the frigid water, in and out until finally the sky is dark again and he comes back home.
"Mom," he says, "can I ask you a question?"
"Of course," she answers.
"Am I a polar bear?"
"Of course you are," she replies.
"Okay," he says.