Access our award-winning, free resources for teaching and learning science.

About us

We create and provide high-quality, accessible, educational content in the science, technology, engineering and mathematics (STEM) disciplines at the introductory undergraduate level.

Learn More
We support NGSS

Our exclusive content integrates science and engineering practices with disciplinary core ideas and cross-cutting concepts in alignment with the Next Generation Science Standards.

Learn More

Quick Quiz

Any kind of rock can melt to form magma.

Go to Quiz

Module of the day

DNA I

This module is the first in a series that discusses the discovery, structure, and function of DNA. Key experiments are discussed:…

Go to module

Term of the day

crystal

[noun] A solid of defined shape that is bound by plane surfaces (facets) that intersect at characteristic angles. The shape of a…

Go to term