![A mole and the number of atoms or molecules in a mole](/sites/default/files/styles/resource_card_image_360x300_/public/2020-07/mole_on_hill.jpg?itok=K06_BGPZ)
Moles and Molarity: Counting and Chemistry from Donuts to Soap
STEM Explained
To count tiny things like atoms and molecules, scientists use a measurement called the mole.
Vivienne Jaehn-Kreibaum
Career Profiles
Electrical Engineer
![hermographic image a woman’s head and neck](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/woman_thermographic_image.jpg?itok=a3KKwvMC)
Thermal Imaging
Backgrounders
Learn about uses of thermal imaging as a medical imaging technology.
![Colour-enhanced MRI of brain and eyes](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/mri-brain_and_eyes.jpg?itok=nvD1FxxQ)
Magnetic Resonance Imaging
Backgrounders
Learn about the history, function, uses, benefits and risks of Magnetic Resonance Imaging (MRI) as a medical imaging technology.
![Roger Bragg à l'extérieur avec un VTT](/sites/default/files/styles/career_image/public/2020-01/roger%20bragg3.jpg?itok=4zW-xnNP)
Roger Bragg
Career Profiles
Construction Electrician
![Measuring radiation in Chernobyl](/sites/default/files/styles/resource_card_image_360x300_/public/2019-11/measuring_radiation_in_Chernobyl.jpg?itok=wrUYuc2O)
Radiation Effects on the Body
Backgrounders
This backgrounder explains the potential effects of radiation on the human body.
![Farah Halsaad | Chimiste industrielle](/sites/default/files/styles/career_image/public/2019-09/Farah%20Halsaad.png?itok=8bEInXR8)
Farah Halsaad
Industrial Chemist
![Scott Kelly et Terry Virts inspectent le système d’élimination du dioxyde de carbone de la SSI (Photo via Wikimedia Commons)](/sites/default/files/styles/resource_card_image_360x300_/public/2019-08/6572.jpg?itok=uSk7J690)
Carbon Dioxide on Earth and on the ISS
Backgrounders
Carbon dioxide is an important part of the air on Earth and in space. What is carbon dioxide? How is it measured? How can it affect us mentally and physically?
![Thundersnow near a cabin on a hillside](/sites/default/files/styles/resource_card_image_360x300_/public/2019-09/Thundersnow_near_cabin_on_hillside.jpg?itok=IugkyK5e)
Thundersnow: winter thunderstorms
STEM Explained
When thunder and lightning occur but the main form of precipitation is snow, not rain, it’s called thundersnow.
![What is the Greenhouse Effect?](/sites/default/files/2019-08/what-is-the-greenhouse-effect.jpg)
What is the Greenhouse Effect?
Hands-on Activities
Explore the greenhouse effect and learn about the impacts it can have on the environment.
![Which materials bounce?](/sites/default/files/2019-08/which-materials-bounce.jpg)
Which materials bounce?
Hands-on Activities
Balls go up and down. But what makes for a good ball? Find out by exploring which materials bounce.
![Artist’s interpretation of astronaut in space](/sites/default/files/styles/resource_card_image_360x300_/public/2019-12/Astronaut_in_space.jpg?itok=650F3G6e)
What are the Different Types of Radiation?
Backgrounders
Learn about the different types of radiation, how they interact with atoms and how they can affect you.
![Screen captures from embedded Kurzgesagt – In a Nutshell videos](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/pros_cons_nuclear_energy.png?itok=NVvZ7d08)
What are the Pros and Cons of Nuclear Energy?
STEM Explained
These two “point-counterpoint” videos provide arguments for and against using nuclear energy to generate electricity.
![What do magnets do?](/sites/default/files/2019-08/what-do-magnets-do.jpg)
What do magnets do?
Hands-on Activities
Have fun discovering what magnets can pick up in this hands on activity.
![Charging a cell phone](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/charging_a_cell_phone.jpg?itok=ugTEHYXD)
What If You Could Charge Your Phone Using Radio Waves?
STEM Explained
Could we use radio waves to charge electrical technologies in the future?