How does a yo-yo climb back up its string? Why does a boomerang come back to you? And how does a kaleidoscope work? These and other mind-bending questions are answered in this explanation text about how toys work.
- Limba : Engleza
- Data Publicarii : 01 Jan 2005
- Format : Paperback
- Numar pagini : 24
- ISBN : 9780007186273