![Students looking bored in class](/sites/default/files/styles/resource_card_image_360x300_/public/2019-09/Students_looking_bored_in_class.jpg?itok=Wr5c_zOj)
Is There Too Much Carbon Dioxide in Your Classroom?
STEM Explained
Did you know that too much carbon dioxide in the classroom can affect your body, and even your grades?
![Electronic cigarette and traditional cigarettes](/sites/default/files/styles/resource_card_image_360x300_/public/2019-09/man-holding-electronic-cigarette.jpg?itok=Mx6yukyD)
Is Vaping Safer Than Smoking?
STEM Explained
Learn how e-cigarettes and other vaping products work, and why scientists and health professionals have concerns about their safety.
![Lighting inside the Destiny Laboratory Module](/sites/default/files/styles/resource_card_image_360x300_/public/2019-12/Lighting_Destiny_Module_Sleep.jpg?itok=0SQn_Sm7)
Light on Earth and on the International Space Station
Backgrounders
This backgrounder explains what light is, how it is measured, and how it affects people on Earth and astronauts on board the International Space Station.
![monster about to sneeze](/sites/default/files/2019-10/cute-little-monster-going-to-sneeze.jpg)
How does snot work?
Hands-on Activities
Make some fake snot and explore the function of mucus in this fun activity.
![How fast does a heart pump blood?](/sites/default/files/2019-08/pexels-stethoscope.jpeg)
How fast does a heart pump blood?
Hands-on Activities
Get active in this activity and explore the impact of exercise on your heart rate. Ready, set, GO!
![orn ethanol plant next to corn field](/sites/default/files/styles/resource_card_image_360x300_/public/2019-09/ethanol_plant_and_corn_field.jpg?itok=eSz-wZxP)
How is Ethanol Made?
Backgrounders
Ethanol is a biofuel that can power a car. Learn about the enzymes, catalysts and processes like fermentation involved in ethanol production.
![How much air do I breathe in?](/sites/default/files/2019-08/How-much-air-do-I-breathe-in.jpg)
How much air do I breathe in?
Hands-on Activities
Learn how to measure lung capacity and about the factors that can affect our lung capacity in this hands on activity.
![Snake with open mouth](/sites/default/files/styles/resource_card_image_360x300_/public/2019-10/Snake_with_open_mouth.jpg?itok=9bjWhnVu)
How Snake Venom Kills… and Saves Lives
STEM Explained
Snake venom can be dangerous for your circulatory system, nervous system or muscular system. But it can also be very useful in medicine.
![Condensation on the window of the Apollo 12 Lunar Module, November 1969](/sites/default/files/styles/resource_card_image_360x300_/public/2019-12/Condensation_window_Apollo_12.jpg?itok=KtlUs1RV)
Humidity on Earth and on the ISS
Backgrounders
Humidity is an important part of life on Earth and life in space. This backgrounder explains what humidity is, how it is measured and how it affects us both mentally and physically.
![Kids camping](/sites/default/files/styles/resource_card_image_360x300_/public/2019-09/children_camping.jpg?itok=Esv5ILLj)
How Do Sleeping Bags Work?
STEM Explained
How do our bodies get cold? How do sleeping bags keep us warm?
![How does detergent work?](/sites/default/files/2019-08/how-does-detergent-work.jpg)
How does detergent work?
Hands-on Activities
Become a pro at washing dishes! Learn how the chemical structure of detergent makes it perfect for attracting grease and grime.
![aging through childhood, adulthood and old age](/sites/default/files/styles/resource_card_image_360x300_/public/2019-09/stages-of-woman.jpg?itok=LhPM5_xB)
Have Scientists Found a Way for People to Live Longer?
STEM Explained
Everything and everyone ages. But scientists have made discoveries about our cells and circulatory and immune systems that could potentially one day be used to increase human lifespans.
![Woman having a panic attack](/sites/default/files/styles/resource_card_image_360x300_/public/2019-09/woman-having-panic-disorder-in-city.jpg?itok=5lAyF1iB)
Chemical Equilibrium and Panic Attacks
STEM Explained
Panic attacks are scary and they upset your body’s chemical equilibrium. Learn what happens to acids & bases in your circulatory system during a panic attack.
![Hand with screwdriver “repairing” DNA](/sites/default/files/styles/resource_card_image_360x300_/public/2019-09/DNA_repair.png?itok=jwH_hm9z)
DNA Damage and Repair
Backgrounders
This backgrounder explains the different ways that cells repair damage to DNA.
![Cocoa beans and cocoa powder](/sites/default/files/styles/resource_card_image_360x300_/public/2019-12/cocoa-beans-and-powder.jpg?itok=IWN1XDWK)
Can Chocolate Make Your Brain Work Better?
STEM Explained
Researchers have found that consuming foods rich in flavanols is linked to more efficient blood flow, which can improve brain function.