Einstein didn't just discover relativity, he proved the existence of atoms in 1905 — more than 110 years ago. Discover how he did it and begin learning about basic chemistry: parts of an atom, atomic mass, atomic number, and how to read...

What does a bank do when it has reached the end of its equity? Sal demonstrates the eleventh-hour attempts by banks to liquidate all assets before doomsday. He also covers some of the rationale behind not accepting market prices and...

Air is clear, so why do we see the sky as blue? The video explains the way light waves travel through the air and the result of our perceptions. It uses simple diagrams and illustrations to reinforce the variety of colors present versus...

This video introduces the institution and function of banks in society by walking viewers through the concept of banking with colorful annotations and simplified narration. The lecture evolves naturally into a discussion about interest...

Some goats have been genetically altered to produce spider silk. This video explains goat behavior, goat adaptations, and why goats faint. It also focuses on their unique eyes, hooves, and taste buds. Did you know a goat can change its...

The breakdown of your breakfast and plants photosynthesizing all relate to the simple movement of electrons. Learn about the complex manner of redox reactions, where electrons move from one compound to another, changing and propelling...

Plants evolved more than 400 million years ago into two types — vascular and nonvascular. Here's a video that explains the difference between vascular and nonvascular plants and then focuses on the over 24,000 types of nonvascular...

Why carry around a heavy suitcase full of gold when you can write a check to your neighbor in the village? Sal's village banks flourish in this video, which introduces checks and demonstrates how they work. While this video is helpful...

Departing from his trademark theoretical balance sheets, Sal guides the viewer through a real-life "outlandish" transaction between Merrill Lynch and Lone Star Funds. Budding economists can exercise their growing economic skills by...

If humans can live without one kidney, how important can they really be? Investigate the vital role these organs play in filtering our blood, removing waste, and managing our bodies' water supply with this short animated video.