Imagine today is the end of the world. There are zombies, snakes and lava closing in on you from all directions. You have with you only a dirty sock, plastic straw and ripped piece of paper. How can you possibly get out of a situation like this?
There is an ancient invention still used in some parts of the world today that allows people to see through walls.What is it?
Imagine that you're in a dark room where there is nothing except a drinking cup. There is a door out of the room but it is locked with 50 locks on the outside. There are guards pointing guns at the door so if you try to escape you will die. How do you get out of the room?
