Science

A brief introduction to biology
Watch an introduction video4 minutes 34 seconds
Biology, defined as the scientific study of life, is an incredibly broad and diverse field. In many ways, it's as kaleidoscopic and rich as living organisms themselves. Biologists study life at many scales, from cells to organisms to entire ecosystems. Begin your own biological journey here!
Start learning
A brief introduction to biology
Biology, defined as the scientific study of life, is an incredibly broad and diverse field. In many ways, it's as kaleidoscopic and rich as living organisms themselves. Biologists study life at many scales, from cells to organisms to entire ecosystems. Begin your own biological journey here!
Start learning
Watch an introduction video4 minutes 34 seconds

Featured biology videos

7:20
Scale of cells
12:12
Mitosis
14:19
Cellular respiration introduction
13:02
DNA
15:24
DNA replication and RNA transcription and translation
A brief introduction to physics
Watch an introduction video9 minutes 30 seconds
Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
Start learning
A brief introduction to physics
Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
Start learning
Watch an introduction video9 minutes 30 seconds

Featured physics videos

8:08
Airbus A380 take-off time
3:01
Loop de loop question
11:49
Normal force in an elevator
11:46
Triboelectric effect and charge
11:02
Electromagnetic waves and the electromagnetic spectrum
A brief introduction to chemistry
Watch an introduction video7 minutes 46 seconds
We will be covering the material in a first year introductory high school or college general chemistry course. This may be your first time taking chemistry, but chances are you know a lot of chemistry already from observing the world around you. We will learn how to explain phenomena by thinking in terms of the atoms that make up all matter, and how atoms interact. Basically, learning chemistry is like having telescopic vision!
Start learning
A brief introduction to chemistry
We will be covering the material in a first year introductory high school or college general chemistry course. This may be your first time taking chemistry, but chances are you know a lot of chemistry already from observing the world around you. We will learn how to explain phenomena by thinking in terms of the atoms that make up all matter, and how atoms interact. Basically, learning chemistry is like having telescopic vision!
Start learning
Watch an introduction video7 minutes 46 seconds

Featured chemistry videos and articles

9:44
The mole and Avogadro's number
4:37
Visually understanding balancing chemical equations
Article
Stoichiometry
Article
Dalton's atomic theory
10:54
Introduction to redox reactions