Science, explained visually

Science is the method we use to figure out how the world actually works: make an observation, form an idea that could be wrong, test it, and keep only what survives the evidence. Know.it's science lessons follow that same spirit. Instead of asking you to memorise definitions, the written explainers focus on the mechanism — the ball accelerates as gravity pulls, the electrons shift in a reaction, the water evaporates, condenses and falls again.

This page gathers every free science explainer in our catalog: short "What is…" answers for core concepts like atoms, energy and photosynthesis, "How does… work?" walkthroughs for everyday phenomena like rainbows, batteries and vaccines, and side-by-side comparisons of ideas students often mix up, such as mass vs weight or heat vs temperature. Every card opens a written explanation. You can request a visual lesson using available credits or plan allowance.

If you're revising for a school exam, catching up on a topic you never quite understood, or just curious, start with a card below or ask your own question. Lessons are available in English, Hindi, Marathi, Tamil, Telugu, Hinglish and Minglish, depending on your plan and selected lesson options, so you can learn science the way you think.