For ecosystems to function they need energy; and we can see how this energy moves through ecosystems with food chains. We also explore how the populations of predators and prey vary over time with predator prey cycles.

This Lucas Detective video lesson is the Mystery of the Missing Car Keys.Students will enjoy joining Lucas in this animated video as they discover STEM subjects and work to unveil the mystery.

Polar bears are actually considered marine mammals, sporting partially webbed feet and swimming up to 30-60 miles across open ocean.

Managing the career of a high-profile athlete is a business that has rapidly evolved, extending beyond endorsement deals into culture, technology and philanthropy. Go inside the world of Kevin Durant as the NBA star makes another title run.

Howcast - A run-on sentence comprises two parts that should stand alone as separate sentences, but have been combined into one overlong sentence.

What can you do if you get an unexpected question on IELTS Speaking Part 3? You need strategies to avoid hesitation and show your fluency! Today you'll learn 3 filler phrases that are perfect for questions that are out of the left field.

This video explores five fun facts about biggest cities.

Since 1998, humanity’s had a permanent presence in space with the International Space Station. The ISS, which circles the Earth once every 90 minutes, is a model of global cooperation: A joint cooperation among five national space...

It's run-on sentence time! Fun is right around the corner in this kid's video lesson that will share what a run-on sentence is and how to fix it! Run-on sentences have to split up into separate sentences, making sure you add periods at...

WOW! In this run-on sentences grammar video for children you will learn about what run-on sentences are and how to fix them! Perfect video for the classroom or home. Let's learn! Homeschool Pop offers a unique, dynamic learning...

Howcast - Learn how to say "no" in Russian with this online Russian language lesson from Howcast.

This video discusses run-on and fragment sentences and the ways to correct them.

This video explores five fun facts about bridges.

This video is a lesson on identifying and correcting comma splices, a type of run-on sentence. The teacher explains what comma splices are and provides three ways to fix them: changing the comma to a period, adding a coordinating or...

Howcast - Learn how to forgive someone who has cheated on you from couples counselor Victoria Wilson, Ph.D. in this Howcast video.

A complete sentence has a capital letter, a subject and a verb, punctuation, and is a complete thought. Fragments and run-on sentences are two sentences that are not complete.

Everyone deserves to recognize themselves in the books they read. See why YA authors think diverse books are so important with these quotes! What do you want to see more of in books? Tell us in the comments below! Subscribe to Epic