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Just how small are atoms? And what's inside them? The answers turn out to be astounding, even for those who think they know. This fast-paced animation uses spectacular metaphors (imagine a blueberry the size of a football stadium!) to give a visceral sense of the building blocks that make our world.

A quick mini-experiment that can help kids to learn about the density of air and the impact that temperature has on density. Similar to the balloon/bottle experiment that I already do in class.

A good mini-lab that can be used to teach kids about density.

Pour a glass of water and watch it turn to ice instantly! This step-by-step tutorial will show you everything you need to know about Instant Ice.

Want to make a glass of water freeze instantly on command? What is this supernatural power and who can use it? Discover the secrets to Ice-bending ... in real life.

The next time you're eating a big bowl of breakfast cereal, take a closer look at the ingredients. You'll find that it contains more than just wheat and corn. Look closely and you might find iron in your cereal... you know, the metal... the stuff used to make nails. Here's an experiment that proves you're eating iron for breakfast.

This video might be great for teaching polarity and dissolving. We're going to show you how to make water-proof sand! It's fun, easy and awesome!

When you combine sand with a water-resistant chemical you create a hydrophobic substance that can clean up oil spills, give you awesome visuals, and quite possibly hours of fun.

Hank does his best to convince us that chemistry is not torture, but is instead the amazing and beautiful science of stuff. Chemistry can tell us how three tiny particles - the proton, neutron and electron - come together in trillions of combinations to form ... everything. In this inaugural episode of Crash Course Chemistry, we start out with one of the biggest ideas in chemistry ever - stuff is made from atoms. More specifically, we learn about the properties of the nucleus and why they are important to defining what an atom actually is.

This could be a fun phase change experiment to try. Dry ice is frozen CO2 -- which needs to stay at a ridiculously low temperature to stay frozen. When you put it in the balloon, it changes phases to a gas -- which is less dense and expands, causing the balloon to fill.

A lesson about every single element on the periodic table

Created by the Periodic Videos team using the TED-Ed platform.