![Telegraph key used in Metcalfe, Ontario telegraph office (Ingenium)](/sites/default/files/styles/resource_card_image_360x300_/public/2019-07/5887.jpg?itok=h9OZd3T9)
Telegraph Key
Interactives
The telegraph works by transmitting signals through an electrical circuit. Learn more and print your own telegraph key using this 3d model of a real artefact.
![The Parkes Observatory in New South Wales, Australia](/sites/default/files/styles/resource_card_image_360x300_/public/2019-10/Park_Observatory_NSW_Australia.jpg?itok=K11hu9qK)
The Search for Extraterrestrial Intelligence - and How You Can Help!
STEM Explained
When astronomers search for extraterrestrial life, they often have to listen for radio waves coming from deep space. If you’re interested, you can help!
![Water: A Natural Reflector Water: A Natural Reflector](/sites/default/files/styles/resource_card_image_360x300_/public/PM_Water_Reflector.jpg?itok=0C01YEYB)
Reflectors
Picture Collections
7 images of some objects that can reflect light such as mirrors, Mylar balloons and water
![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.
![Drop tower ride](/sites/default/files/styles/resource_card_image_360x300_/public/2019-10/Drop_tower_ride.jpg?itok=39sxzXhn)
How is Lenz's Law Used in Drop Tower Rides?
STEM Explained
How do magnetic fields help you get down safely from the top of a drop tower ride? Learn how electromagnetic induction works at the amusement park.
![Image © exdez, iStockPhoto.com](/sites/default/files/styles/resource_card_image_360x300_/public/2019-09/Image%2C%2C.jpg?itok=ywUpwGCd)
How Can Your Doctor Use the Data in You?
STEM Explained
Scientists are training artificial intelligence to diagnose injuries using x-rays and other medical imagery of you (and millions of others). What improvements and other changes might this bring to the health care system?
![How do I see colour?](/sites/default/files/2019-08/how-do-i-see-colour.jpg)
How do I see colour?
Hands-on Activities
How is light connected to the colours we see? In this STEAM activity make a colourful light catcher and discover why we see different colours?
![Colourful sunglasses](/sites/default/files/styles/resource_card_image_360x300_/public/2021-03/colourful_sunglasses.jpg?itok=mZ_pixQ-)
How Do We See Colour?
STEM Explained
How does the human eye see visible light as colour? And why do some people see more colours than others?
![Gamma ray image of the Milky Way taken by NASA’s Fermi Gamma Ray Space Telescope (NASA)](/sites/default/files/styles/resource_card_image_360x300_/public/2020-03/Gamma_ray_Milky_Way.jpg?itok=5Ju9xdU5)
Gamma Rays: Helper or Hazard?
STEM Explained
Gamma rays might make you think of cancer, harmful radiation or superheroes. But gamma rays have lots of uses: food safety, manufacturing and even medicine!
![Cartoon aircraft in flight](/sites/default/files/styles/resource_card_image_360x300_/public/2019-10/Aircraft_in_flight.jpg?itok=MlDYQ0_o)
Cosmic Radiation and Aviation
Backgrounders
Learn how people came to understand the source of cosmic radiation, as well as how this radiation impacts those who work in and travel on airplanes.
![woman with camera](/sites/default/files/styles/resource_card_image_360x300_/public/2019-10/woman_with_camera.jpg?itok=RPlx-udx)
Eye vs. Camera
STEM Explained
The human eye lets us see the world by sending impulses to our nervous system. In many ways, it is very similar to other optical devices, including cameras.
![heavy metal band](/sites/default/files/styles/resource_card_image_360x300_/public/2019-09/Heavy_metal_band_0.jpg?itok=-Zc4rYXH)
A Taste of Heavy Metal
STEM Explained
Heavy metal is a term for some toxic chemical elements. They can cause problems like bioaccumulation, but are useful in nuclear medicine and medical imaging.
![Ethan Ma | Machine Vision Engineer Ethan Ma | Ingénieur en vision artificielle](/sites/default/files/styles/career_image/public/6356_13.jpg?itok=jZu9IyDk)
Ethan Ma
Career Profiles
Machine Vision Engineer
![Maya Bankovic | Cinematographer Maya Bankovic | Cinéaste](/sites/default/files/styles/career_image/public/6312_13.jpg?itok=5sXq69jR)
Maya Bankovic
Career Profiles
Cinematographer
![Rachel Gardiner | Optometrist Rachel Gardiner | Optométriste](/sites/default/files/styles/career_image/public/6206_13.jpg?itok=83toFPFf)
Rachel Gardiner
Career Profiles
Optometrist