TAMPA, Fla. — Hitting a $16 million Powerball jackpot is a dream for most people.

But losing a fortune by letting those lottery winnings expire is a nightmare — and that's what will happen Thursday if someone doesn't claim the ticket bought in May at a suburban Tampa, Fla., convenience store.

Lottery officials say this will be the largest unclaimed jackpot in Florida since 2003, when someone didn't claim $53 million in the Florida Lotto game.

NEW YORK — Mayor Michael Bloomberg signed landmark legislation Tuesday banning the sale of tobacco products to anyone under the age of 21, making New York the first large city or state in the country to prohibit sales to young adults.During a brief ceremony at City Hall, Bloomberg said raising the legal purchase age from 18 to 21 will help prevent young people from experimenting with tobacco at the age when they are most likely to become addicted. City health officials say 80 percent of smokers start before age 21.