Thirteen-year-old D.J. gets a bad case of "gold fever" when he and Alfred accidentally discover an abandoned--and mysteriously dangerous--gold mine.

By choosing this book to unravel the secrets of black holes, you have taken your first step on a journey to the darkest corners of the universe. Perhaps you've

"What is a black hole? What is dark matter and what is it made of? How do scientists discover black holes and dark matter if they can't be seen? What do scienti

A week’s vacation goes terribly wrong for four young people when hoodlums kidnap and leave three of them tied and gagged two hundred and fifty feet undergroun