Why have there been so many massive Powerball, Mega Millions jackpots recently?

(NEXSTAR) - Yet again, a potentially record-setting lottery jackpot is brewing. This time, it's Powerball, and the current jackpot sits at more than $570 million, roughly $15 million shy of being among the top 10 largest in the game's history.
If the jackpot does surpass $587 million before there's a winner, this would mark the third record-setting lottery prize among Powerball or Mega Millions in as many months and the fourth within the last year. It would, however, be one of the smallest, with