
All snowflakes have six sides. But they all have different shapes.
Look at these two snowflakes. How are they the same? How are they different?
Photo Credit: (l, r) Marion Owen/Design Pics/Getty Images
Light caused by people is called artificial light. Artificial light … read more
Let’s get ready with some safety rules: Wear your helmet … read more
There is a light festival on a street in Chicago, Illinois. This street … read more
© 2026 McGraw-Hill Education. All Rights Reserved.