What's the size of your desk in relation to your teacher's? Or to the chalkboard at the front of the room? Hone your mapping skills with this classroom activity.
This discussion explores how artificial boundaries can decrease mate choice, with a specific example of highways limiting mate choice for bighorn sheep.
Educator Guide, Lesson Plan
This worksheet prepares students to compare this historic food web of the Chesapeake Bay to the food web of the present day.
Some scientists believe the fate of humankind was changed when humans first began to tame the wild horse. Learn more about how horses have shaped our world.
Focus on the best books about astronomy, astrophysics, light, telescopes, digital imaging, and the 3-D universe with this list of recommended titles, suitable for older students and adults.
Did you know that squamates have a third eye? Or that the Gila Monster and the Bearded Lizard are the only two known venomous lizards? Discover more interesting facts about squamates.
It's not surprising that the larger the world's population grows, the more fresh water we consume. But what is surprising is just how much of this precious commodity we've depleted in recent years.
Did you know that the world's deserts keep expanding each year? Or that islands have the highest animal extinction rate—75 percent? Take a closer look at the major habitats found on Earth.
Gravity helps form the stars and planets and helps keep them in orbit. Yet, it can also cause these objects to collide. Explore the many ways gravity shapes—and reshapes—the universe.
More than likely with a good guess you could detect a heart-shaped leaf from one that's oval or narrow. But do you know how to recognize a leaf that has a lobed or divided shape? Learn how.