MinutePhysics
Passing A Portal Through Itself
This video is about what happens if you try to pass a portal (like in the video game Portal or Portal 2) through itself - do you get a paradox? Infinite recursion? Impossibility? Contradiction? The end of the world? Collapse of the...
MinutePhysics
Another Portal Paradox
What happens if you extend a piston through a portal? Or try to sandwich a cube between two portals? That's right, it's time to explore more portal paradoxes!
MinutePhysics
The Portal Paradox
This video is about the Portal Paradox - a paradox in the video game Portal (and Portal 2) regarding whether or not a companion cube passing through a moving portal plops out of the other end with no speed (velocity, momentum), or shoots...
PBS
Proving Brouwer's Fixed Point Theorem
There is a proof for Brouwer's Fixed Point Theorem that uses a bridge - or portal - between geometry and algebra.
TED-Ed
TED-Ed: Can you solve the time travel riddle? - Dan Finkel
Your professor has accidentally stepped through a time portal in his physics lab. You’ve got just a minute to jump through before it closes and leaves him stranded in history. Your only way back is to grab enough colored nodules to...
Curated Video
Portal 2 Secrets / Chapter 6 - Aperture 1970s - Vitrified Doors 4-6
Howcast - Check out this Portal 2 Co-op walkthrough and find the last three vitrified doors and the Borealis dock with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 5 - Part 9 - Co-op Ending and Credits
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 5 - Part 9 - Co-op Ending and Credits with this online demo.
Curated Video
Portal 2 Secrets / Chapter 2 - Room 03/22 - The Lab Rat's Song
Howcast - Check out this Portal 2 walkthrough and find the Lab Rat's song (Exile Vilify by The National) with this online demo.
Curated Video
Portal 2 Secrets / Chapter 2 - Room 06/22 - Final Transmission
Howcast - Check out this Portal 2 walkthrough and find the final transmission with this online demo.
Curated Video
Portal 2 Secrets / Chapter 3 - Room 16/22 - The Turret Song
Howcast - Check out this Portal 2 walkthrough and find the secret turret song with this online demo.
Curated Video
Portal 2 Secrets / Chapter 6 - Aperture 1950s - Vitrified Doors 1-3
Howcast - Check out this Portal 2 walkthrough and find the first three vitrified doors with this online demo.
Curated Video
Portal 2 Secrets / Chapter 7 - Propulsion Gel Room 1 - Portrait of a Lady
Howcast - Check out this Portal 2 walkthrough and find a secret portrait of Cave Johnson and Caroline with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 5 - Part 4 - Room 04/08
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 5 - Part 4 - Room 04/08 with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 5 - Part 5 - Room 05/08
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 5 - Part 5 - Room 05/08 with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 4 - Part 8 - Room 08/09
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 4 - Part 8 - Room 08/09 with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 4 - Part 9 - Room 09/09
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 4 - Part 9 - Room 09/09 with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 5 - Part 7 - Room 07/08
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 5 - Part 7 - Room 07/08 with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 5 - Part 6 - Room 06/08
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 5 - Part 6 - Room 06/08 with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 5 - Part 3 - Room 03/08
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 5 - Part 3 - Room 03/08 with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 5 - Part 2 - Room 02/08
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 5 - Part 2 - Room 02/08 with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 4 - Part 6 - Room 06/09
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 4 - Part 6 - Room 06/09 with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 5 - Part 1 - Room 01/08
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 5 - Part 1 - Room 01/08 with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 3 - Part 8 - Room 08/08
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 3 - Part 8 - Room 08/08 with this online demo.
Curated Video
Portal 2 Co-op Walkthrough / Course 4 - Part 7 - Room 07/09
Howcast - Check out this Portal 2 Co-op walkthrough and beat Course 4 - Part 7 - Room 07/09 with this online demo.