How can we make the icy path less slippery? How can we choose how fast to go down a slide? What's the best way to get muddy clothes clean? In this boldly original book, a group of young friends ask intriguing questions about the world around them, inspiring readers to speculate, investigate, and find out the answers for themselves.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.