Physics explained
Mechanics, relativity, astronomy, and the physics hiding in plain sight.
Physics for the incurably curious
Let’s getphysical.
I’m Dr. John. I teach college physics, make videos, and spend a crazy amount of time checking whether conspiracies survive basic physics.
Videos, livestreams, and debates. Join the community ↗
HOW WE DO PHYSICS
- 01Ask the question?
- 02Build the modelƒ
- 03Check the prediction→
- 04See what holds up✓
College physics professor
Former aerospace materials researcher
YouTube creator
Live debate regular
Watch & explore
When a claim sounds wild,
do the math!
I make videos about physics, space, experiments, and scientific claims that need a closer look. We start with the evidence, run the numbers, and see where they lead.
LATEST FROM @DRJOHNDEV
Start with the latest video.
Some questions are serious. Others... not so much. Either way, we show the physics, check the numbers, and see what holds up.
Browse every videoConspiracies tested
Flat Earth, Moon landing hoaxes, and other conspiracy theories fall apart pretty quick once the numbers show up. Not my opinion, just physics.
Live debates
Long-form conversations where disagreement is welcome, but “trust me, bro” isn't going to cut it.
Meet Dr. John
I teach physics. I apply physics. But never imagined needing to debunk with physics.
I’m John Gruenewald, a college physics professor and the person behind @DrJohnDev.
Before I started teaching, I worked in the aerospace industry on infrared detector technology for space telescopes and defense systems. I bring that hands-on experience to the classroom, YouTube, and live debates.
The goal is simple: show the model, do the math, and give you enough information to check the result yourself.
Physicsfrom first principles
Aerospace Materialsreal research experience
Skepticismclaims meet numbers
The community
Curious people.
Good questions.
The Discord is where we keep the conversation going after the stream. We talk physics, math, skepticism, upcoming videos, and whatever strange rabbit hole we find next.
Join the Discord01
Be curious, not combative. Disagreement is welcome. Disrespect isn’t.
02
Critique ideas, not people. Go after the argument, method, and evidence.
03
Bring receipts. “Trust me, bro” is still not a citation.
Support the channel
Help put better physics
on the internet.
Every video takes research, writing, experiments, graphics, and editing. Viewer support gives me the time and tools to dig deeper, build better demonstrations, and keep the finished work open to everyone.
WHERE YOUR SUPPORT GOES
Better physics takes time, tools, and researching topics.
Most videos begin with a simple question and then pursue some seriously unexpected directions in trying to answer it. Contributions cover the research, equipment, software, and production work in between.
Research that goes deeper More time to follow a claim properly and show the full reasoning.
Demonstrations you can see Better equipment, stronger visuals, and more reliable livestreams.
More physics for everyone The main videos stay public and easy to share.
If you have learned something here, enjoyed a stream, or watched a conspiracy fall flat on its flat face, I’d be glad to have you on the team.
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Get in touch
Have something worth exploring?
Let’s talk.
Planning a podcast, debate, interview, speaking event, collaboration, or sponsorship? Send me the details. If it sounds interesting, I want to hear about it.
Prefer email?
john@drjohn.dev