How does gravity shape our universe? Can sand dunes migrate? Scientists begin their investigations by asking questions about the world around them. Can a Train Fly? will explore fascinating questions about forces and inspire you to think like a scientist. Features include author/illustrator biography, comprehension questions, educational front/back matter, full-color photographs, glossary of key words, index, informative sidebars, note to parents and educators, and table of contents. Downloadable Teacher Notes available.