Science
Understand the natural world through first-principles explanations, activities, and evidence-based reasoning.
01
Chemical Reactions and EquationsChemical reactions are the foundation of chemistry.
→
02Acids, Bases and SaltsAcids and bases are everywhere in our world.
→
03Metals and Non-metalsMetals and non-metals form two distinct categories of elements with dramatically different properties.
→
04Carbon and Its CompoundsCarbon is the most versatile element on Earth.
→
05Life ProcessesWhat makes something alive? It's not just movement or growth—plants are alive but don't walk.
→
06Control and CoordinationImagine touching a hot stove. Before you even consciously register pain, your hand pulls away. This is coordination in action.
→
07How do Organisms Reproduce?Reproduction is the process by which organisms create new individuals. Without reproduction, species would disappear.
→
08HeredityYou inherit your eye color from your parents. Your talent for music or mathematics might run in your family. Yet you're not an exact copy of either parent.
→
09Light — Reflection and RefractionLight enables vision and makes the world visible. Yet light's behavior is subtle and fascinating.
→
10The Human Eye and the Colourful WorldThe human eye is a remarkable optical instrument that transforms light into the vivid, colorful world you see.
→
11ElectricityElectricity powers modern civilization. From smartphones to hospitals to transportation, electricity is the lifeblood of our world.
→
12Magnetic Effects of Electric CurrentElectricity and magnetism are intimately connected. A moving electric charge creates a magnetic field.
→
13Our EnvironmentThe natural world is not a collection of isolated organisms. Every living thing exists within an interconnected web of relationships—ecosystems.
→