I've been told it won't be that tough, and they'll actually give you the answers before they ask the questions.
So what's the incentive? CASH and PRIZES!
There will be a prize given away each day, including a grand prize of a $50 gift card to Amazon for one lucky participant!
The rules are simple, it's free to participate, and you can find more details here: http://everythingishistory.
The winner for the day will then be chosen at random from the correct answers and will be announced the following morning. Prizes include the books State by State: A Panoramic Portrait of America, and How the States Got Their Shapes, and a few others.
The blog is pretty cool too... so check it out.