The Power of "How?"

As a result of a recent column by Julian Baggini (lots of links here), I find myself thinking about the power of "how?"--as in, the power to induce skepticism that lies in there being no explanation how a purported event happens.

So ... Santa Claus supposedly circles the globe on Christmas Eve and invades houses through chimneys, leaving presents for good boys and girls.   I can't say how,