Where Did That Curly Hair Come From?

Where does the mass for a growing tree come from? Scholars consider a few different hypotheses and guess which is correct. They then analyze data from different experiments to understand which concepts science supports.

In this age of globalization, the foods we eat often come from countries scattered all around the world. This research-based lesson asks young scholars to pick two of their favorite food items and investigate the origins of their...

From stately oaks to towering pines, trees are the largest members of the plant kingdom that most people see. But how do trees get so big? Find out where the mass of a tree comes from with a short video. The narrator presents the topic...

From Boston to Bora Bora, humans have the same facial expressions to convey grief, surprise, and disgust. How did we all end up on the same page emotionally? Explore innate and learned expressions in the 133rd video in a 143-part series....

What are we made of and where did all of this stuff come from? From the Big Bang to star dust, the narrator of an entertaining video explores many different theories. Scholars learn the sequence of events that had to occur to create the...

Gold comes from rocks, but rocks can't produce gold—so where does it really come from? The video presents two competing theories of where gold comes from and how it is produced. 

The truth about strange unexplained cosmic rays? They're still unexplained! Share one of our universe's many unsolved mysteries with your class using a video from the Physics Girl playlist. The resource describes what cosmic rays are,...

Where did our classification system come from, and why is it so important? Budding biologists discover binomial nomenclature through a brief but informative video. The resource covers the three kingdoms, then branches out from there to...

It's commonly known that over 70 percent of of the earth's surface is covered by water, but exactly where did it all come from? Join this short video as it travels back to the beginning of the universe in search of the origins of this...

No, you didn't get your genes from the local clothing store. Learn where they really come from by watching this video as it explores how the genes found in all plants and animals today have arisen over billions of years of mutations from...