
Winter is coming. It is colder outside. There are fewer hours of sunlight. When you wake up, is it dark outside? When students ride the school bus or walk to school, the sun is rising.
Photo Credit: LanaG/Shutterstock
All birds have wings but not all birds can fly! … read more
You hear the word infrastructure in the news. But what … read more
Humans are mammals. Humans sweat when their bodies get hot. … read more
© 2026 McGraw-Hill Education. All Rights Reserved.