ST. CHARLES, Minn. – Somebody these past few weeks bought a $50,000 Powerball lottery ticket at the Whitewater Travel Plaza at the Interstate 90 exit into St. Charles. We may never know who — because law regards the names of winners of more than $10,000 as private information. The winner, whoever he or she may be, has one year to claim the money. Meanwhile, the big Powerball  winner, of $654 million, was in Washington state.