Move the Moon.
Tilt the Earth.
See what happens.
Hands-on science lessons for grades 6–12. Every lesson is a simulation you control.
Free to try right now
All lessons →
Drag a magnet, map its field lines, and measure how fast the field fades.
Move the Moon around Earth and watch its shape change.
Add protons, neutrons and electrons and watch the element change.
Mass vs. weight, and why gravity gets weaker with distance.
How lessons work
Play with it
Each lesson opens on a live simulation. Drag, tilt and change things until something surprises you.
See why
A short explanation next to the simulation tells you what you just saw, with real numbers.
Check yourself
Most lessons end with a quick quiz that explains why each answer is right or wrong.
Teaching this in class?
Printable worksheets, plus a Classroom plan: $99 a year, up to 99 people.
Solar System Speed Run
Learn the eight planets in order, then prove it without peeking. 5–10 minutes.
Pricing
Compare plans →Classroom
- Every lesson for every student
- Printable worksheets for the teacher
- Add other teachers, who take a seat each
Questions
All questions →Do I need to install anything?
No. Lessons run in any up-to-date web browser. They work best on a laptop or desktop, because the simulations need room.
What's free?
14 lessons are free forever, including Magnetism, Moon Phases, Build an Atom and Black Holes. Pro opens all 50 lessons and every worksheet for $6 a month.
Can I use it with my class?
Yes. Classroom is $99 a year for up to 99 people, teachers included, and worksheets are included. Need more than that? School is $1 per person a year, 100 people and up.
How do I cancel Pro?
Go to your Account settings and click Cancel Renewal. You keep Pro until the end of the month you already paid for.