What’s inside you?

Your heart has beaten about 40 million times this year. Your immune system just destroyed a threat you never saw. Your bones are literally rebuilding themselves as you read this. You don't need to memorize anything or know any science words — just bring your curiosity. By the end, you'll be the person who actually knows how things work: why fevers are your body fighting back, why muscles hurt after exercise (and why that's good), what DNA really does. That's knowledge you'll use way beyond any test. 25 short video lessons (5–7 min each), each one starting with a question you already have — like "Why does my heart race when I'm scared?" — and answering it with real science, cool metaphors, and zero textbook vibes. You'll test yourself after every lesson and see results right away. Your first "wait, THAT'S how it works?!" moment hits in the very first lesson. By lesson 25, your body stops being a mystery — it becomes the most fascinating thing you've ever explored.