Asking Why

There is one word that is so powerful it can unlock almost any mystery in the world. That word is WHY. Why does the sun rise every morning? Why do we need sleep? Why do some things float and others sink? Why are some people mean and others kind? Why, why, why — this little word has driven some of the greatest discoveries in all of human history. Today you are going to learn why why is so special, and how to use it like a thinker.

Why Gets to the Reason Behind Things

When you ask what, you get a fact. When you ask where, you get a location. When you ask when, you get a time. But when you ask why, you get something much deeper: the reason. Here is an example. A boy named Leo noticed that his dog always ran to the door when his dad came home from work. Leo could have just accepted that as a fact and moved on. But Leo asked why. Why does the dog always run to the door? Leo found out that dogs can hear and smell things from much farther away than humans. The dog could smell his dad coming from down the street! Asking why turned a simple fact into a fascinating discovery about how dogs experience the world.

Scientists, engineers, and inventors all use why constantly. Doctors ask why does this medicine help some people but not others? Engineers ask why does this bridge design hold more weight? Inventors ask why does this machine keep breaking at the same spot? Each why question leads to an answer. But here is the exciting thing: that answer almost always brings another why with it. Why does the dog run to the door? Because it can smell dad coming. Why can dogs smell so much better than humans? Because they have many more smell receptors in their noses. Why do dogs have so many more smell receptors? Because their ancestors needed to track prey to survive. One why leads to another, and another, and another. You can follow a chain of why questions deep into any subject in the world.

Here is a game that great thinkers play. It is called Five Whys. You start with a fact or a problem. Then you ask why five times in a row, each time asking why about the previous answer. Try it: The sidewalk is wet. Why? It rained. Why did it rain? Clouds were full of water. Why were the clouds full of water? Water evaporated from oceans and rivers. Why does water evaporate? Heat from the sun turns liquid water into vapor. Why does heat do that? Because heat gives water molecules enough energy to escape into the air. Five whys took us from a simple wet sidewalk all the way to the science of molecules and solar energy. That is what asking why can do!