Sweet farts - Raymond Bean

Keith Emerson discovered the cure for the common fart when he invented Sweet
Farts. At age ten, Keith is a self-made millionaire who runs a science lab and is
in charge of his own company—so what could possibly be bothering him? Well, his
four-year-old sister’s newfound love of farting is causing all kinds of problems.
His friends spend most of their time and energy trying to embarrass him for
fun. And if that isn’t enough to drive a kid crazy, the big science fair is
weeks away and Keith has no idea what to do for his next experiment.

This time around, Keith will attempt to discover something new and amazing in
time for the big science fair, deal with his friends’ constant teasing, and help
his sister, Emma, learn the complex etiquette of farting. Sure he made one of the
greatest scientific discoveries of all time, but the question facing him now is
"What’s next?"