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The PhET Blog
Physics Education Technology - University of Colorado, Boulder

PhET is an Open Source Project!

Did you know as an project all of our code is on ?


Jan 21


Call for Photos of International Students Using PhET Sims

Do you have a photo of students using a PhET sim that we could use? We are looking for high-resolution photos of our sims being used by students. If you have one that you can contribute, please e-mail


Jan 15


Going to FETC 2016 in Orlando?


Visit PhET at #FETC 2016 in Orlando, FL January 13-15. PhET’s Science Specialists, Amy Rouinfar and Amy Hanson, will be at our Booth #1007 to answer your questions and show off our latest HTML5 sims and other exciting developments coming up in 2016!

About Future of Education Technology Conference (FETC)
The Future of Education Technology Conference (FETC) gathers education leaders and technology experts to exchange techniques and strategies for teaching and learning success. Known worldwide for its outstanding program, FETC provides educators and administrators the opportunity to explore the integration of technology across the curriculum — from pre-K – 12 — through hands-on exposure to the latest hardware, software and successful strategies. For more information, please visit


Jan 7


Scheduled Maintenance: Monday, January 4, 2016 at 11:00 PM Mountain Standard Time

We will be upgrading the PhET servers on Monday, January 4 at 11:00 PM Mountain Standard Time. We expect that the maintenance will last only 60 minutes. During this time, PhET ( may experience periods of unavailability. If you experience persistent issues, please e-mail the PhET Help Desk at

Thanks for your patience during our system maintenance.


Jan 3


Happy New Year and There’s Still Time!

Happy New Year to everyone around the world.

We are excited to bring more HTML5 sims in 2016. Won’t you help us with a small $10 donation?

And, thanks to everyone who has already donated in 2015! It really helps support the HTML5 work.

Donate today at:



Dec 30


New HTML5 Bending Light Sim!


Play with the new HTML5 Bending Light sim and explore how light bends when it encounters an interface of two different indices of refraction. See how changing from air to water to glass changes the bending angle. Play with prisms of different shapes and make rainbows.



Dec 23


New HTML5 Arithmetic Sim


We are excited to have the HTML5 version of Arithmetic. Learn multiplication, division and factoring with this new sim!



Dec 18


Donate Today to PhET’s Annual Giving Campaign and Help Bring More Sims to HTML5


Dear PhET Friends, Users and Supporters,

A big ‘Thank You!’ to all of you who have already supported PhET during our registration process!

If you considered donating, but haven’t gotten to it yet, there’s still time! Remember, we rely on donations from people like you. Your donation will go to building more HTML5 sims. Every dollar really does help! So please pitch in and keep PhET free for millions of learners around the world.

Suggested donation amounts are:

  • $15 (if you use 1-4 sims)
  • $25 (if you use 5-14 sims)
  • $50+ (if you use 15 or more sims)

Make your gift today:

Or, if you’d like to donate specifically to bring Circuit Construction Kit to HTML5, donate here:

Thank you and Happy New Year!

Your PhET Team,
Dr. Kathy Perkins, Director and Dr. Kathy Dessau, Assistant Director
along with Aadish, Amanda, Amy H., Amy R., Argenta, Ariel, Arnab, Ben, Beth, Bryan, Bryce, Carl, Chris, David U., David W., Emily M., Emily R., Jesse, John, Jonathan, Liam, Linda, Mariah, Matt, Michael, Mike, Oliver O., Oliver N., Robert, Sam R., Steele, Stephanie, and Trish


Dec 15


Feeling Off Balance?

Balancing Act

Feeling off balance this holiday season? Try putting some balance back into life with the Balancing Act sim and teach about force, torque and rotation.


Dec 8


Support STEM Ed on #GivingTuesday


It’s #GivingTuesday, a global day dedicated to giving back!

Give the gift of science and math to millions of children around the world by supporting your favorite OER STEM resource.

If you’d like to donate to PhET, support us at


Curious about #GivingTuesday? Learn more at:



Dec 1