Mr Aedann See, 19, and his sister Deanna, 25, have both won the Molecular Frontiers Inquiry Prize. Read more at ...

NPR's Ayesha Rascoe plays the puzzle with Weekend Edition Puzzlemaster Will Shortz and WUSF listener Wendy Belkin of Clearwater, Fla.

The basic flow of football is this: A team gets four plays, called downs, in order to move the ball in 10-yard increments.