Washington (AFP) – The US Powerball jackpot grew to a staggering $1.9 billion -– the largest prize in world history -– after yet another week without a winner, ensuring a new surge in lottery fever across the country. The winning numbers for Saturday’s draw were 28, 45, 53, 56 and 69, with a Powerball of 20. With no ticket matching the five numbers and the Powerball, the pot rolls over with a grand prize of $1.9 billion up for grabs in Monday’s draw, organizers said. The Powerball jackpot is the biggest ever amassed, surpassing the already record $1.6 billion which went unclaimed in Saturday’s…