We can see light. We know it makes plants grow. Light pours from the sun and from glowing light bulbs. But we can't touch it, or hold it. What is light? Learn about this science basic, and then get hands-on with an experiment that will light up the classroom.
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.