Short and sweet: be the first to solve our riddle and win a free T-shirt of your choice from the mental_floss store:

With noggin in oven
It has letters seven
But contains eleven
And takes you to heaven

Answer by commenting to this post; PLEASE REMEMBER that comments are moderated and won't show up until they're released, so they may not appear right away. We'll reveal the correct answer tomorrow (Saturday) morning, April 12, along with the winning answer to last week's Weekend Genius Challenge. Good luck!