Q. A small iron nail sinks in water, but a heavy boat floats on its surface. How? Ans. It is the density of an object that dertermines whether the object will sink or float in water. Objects with ...

WHY? is our attempt to answer all the questions every little kid asks. Have a question? Send it to why@mentalfloss.com. I bet you know that wood floats but a rock sinks. But why? Let’s look deep ...