You are lost in the desert. You are out of water. You can see a spring on the horizon. You run over and touch the cool water. Your mom has told you never to drink water straight out of the ground. All you have is two clean plastic cups, and no way to make a fire to sterilize the water. How do you drink the water?
Answer
You should fill one of the cups with the spring water and hold the filled cup over the other cup and gently shake it. This is because the cool spring water will create condensation on the outside of the cup, which will drip into the other cup. You should drink from the cup on the bottom.
