What goes up must come down. Everybody knows that. But what is it thatpulls everything from rocks to rockets toward the center of the earth? Itsgravity. Nobody... » 

What goes up must come down. Everybody knows that. But what is it thatpulls everything from rocks to rockets toward the center of the earth? Itsgravity. Nobody can say exactly what it is but gravity is there pulling oneverything all the time. With the help of an adventurous scientist and hisfunloving dog you can read and find out about this mysterious force. «