Bob Newbie, age 13, of Garden Grove, Calif., for his question:

Who invented dynamite?

A sizable percentage of young students invent dynamite during every semester of chemistry classes. But they are not the first. The first was young Aired Nobel Of Sweden. He worked in his father's factory with the idea of developing a new explosive. His first try was nitroglycerine, but the tricky stuff was so dangerous that Nobel was regarded as a public menace.

Something had to be done to make the explosive Safer and, if possible, accident proof. Nobel had the idea of packing nitroglycerine with absorbent substances. The result was dynamite. It was invented and named by Alfred Nobel, age 34, in the year I867.