Real Science from Day 1
Live, hands-on online physics classes for curious kids ages 6–10.
Taught by Dr. Katerina Visnjic, Senior Lecturer in Physics at Princeton University
and Founder of Physics 4 Life.
Electricity and Magnetism:
the Fascinating Journey to their Unification
⚡ Our Fall 2026 course is underway!
Next course planned for early 2027.
Join our email list to stay informed.
See our course in action:
“Dr. Kat guides students to experience discovery firsthand. She doesn’t just build their knowledge base like a Wikipedia page—she helps create true scientists.”
-Parent of Alex, age 8
What students experience
💡 Real experiments
Students design their own hands-on experiments and draw scientific conclusions.
🙋 Small classes
Weekly live classes with Dr. Kat, limited to 12 students so everyone can participate.
💬 Community
Students post their explorations on the course forum and get support throughout the week.
Meet Dr. Kat
Hello! I’m Dr. Katerina Visnjic, Senior Lecturer of Physics at Princeton University, though my younger students know me as Dr. Kat. For over a decade, I’ve focused on rethinking how physics is taught, and developing research-based methods that make learning more engaging, intuitive, and meaningful. My mission to make physics accessible to everyone extends beyond the classroom through my award-winning YouTube channel, Physics 4 Life.
In my classes, students don’t just learn established ideas – they use observation, experimentation, and reasoning to create knowledge for themselves. The goal is not only to ask, “What do we know?” but also, “How do we know what we know?”
I’m also a mom of three, which shapes how I create a supportive environment where students can explore, take risks, and build confidence.
What families are saying
“Our son took Dr. Kat’s pilot course and he loved it so much, and got so much out of the way physics was taught, that we’ve enrolled him again this fall to take his understanding even further.”
– parent of Wade, age 6
“I used to work with breadboards and circuits in high school. Seeing my 9-year-old casually build circuits and plot graphs is blowing my mind!”
– parent of Akshu, age 9
“The weekly challenges have really given her confidence to push through any difficulty or confusion she had. It was a great way to build some independence in our homeschool environment.”“
– parent of Mimi, age 10
“He now looks at electronics much more analytically and wants to understand the “why” behind how circuits work, not just assemble them. The course really strengthened both his curiosity and confidence”
– parent of student, age 7
“He used to rely mostly on simulations. Now he wants to experiment and test his own ideas.”
– parent of Alex, age 8
“He initially decided not to enroll, but he has worked his way into the camera frame alongside his brother, is now helping with experiments, and is answering questions. I’m glad to see the class drawing him in.“
– parent of students, age 8