High School, Physical Science

A molecule can be roughly thought of as any group of atoms stuck together. Here you will learn some important details.

While we used to think atoms were fundamental particles, we now know they are made of smaller parts still.

Ever wonder how we actually know that atoms exist? Here we’ll learn what atoms are and exactly how scientists went about figuring all of this out.

What exactly is life and how could we know if we ever spotted an alien? NASA has some ideas!

The RNA World Hypothesis proposes that chains of RNA were the first living things on Earth. Here you’ll find out why.

If the origin of life happened before scientists were around to observe it, how can our origin be studied with the scientific method? This question is answered in our overview of the Miller-Urey experiment.

The origin of life is still a mystery, but the careful study of chemical evolution is beginning to provide us with possible answers.

The theory of evolution tells us how life diversified after it got started, but how did the first evolving creatures come about?

A molecule can be roughly thought of as any group of atoms stuck together. Here you will learn some important details.

Ever wonder how we actually know that atoms exist? Here we’ll learn what atoms are and exactly how scientists went about figuring all of this out.

Ever wish you understood genetics? It’s way easier than you think. Mastering the basics only takes 5 minutes.