How should teachers rank their students' performance?
A computer science professor encourages his students to break Sudoku's rules
A fictional city grapples with the white stuff
Spare parts mean more weight, more expense and less science. What if the redundancy worked differently?
Can you save a fictitious island's residents from being swept out to sea?
What if, on another planet, it took five parents to produce a brood?
What if you could reengineer the buttons on your alarm clock to reduce the number of times you needed to push them to set it?
How to use remote-controlled cars to figure out the best way to get from Connecticut to Bermuda
In this puzzle, figure out how fast each leg of your trip should be to make it as fast as possible