
Germany has many castles. This is Heidelberg Castle. It is very old. Some parts of the castle were built 800 years ago! Kings once lived there. The castle sits on a hill. The city of Heidelberg lies below it.
Photo Credit: Brian Hauser
Animals have teeth, too. But animal teeth are not all … read more
Food scientists make our food safe. They study ways to … read more
On June 14, America celebrates Flag Day. Let’s find out … read more
© 2026 McGraw-Hill Education. All Rights Reserved.