A learning space for science educators and students

Free Award-winning Content
Free Award-winning Content

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

About us
Next Generation Science Standards
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.

About NGSS

Quick Quiz

Globally, precipitation far exceeds evaporation.

Go to Quiz

Module of the day

Sergio Avila

This module offers an in-depth profile of wildlife biologist Sergio Avila and his work to conserve endangered jaguars and other wildlife…

Go to module

Term of the day


[adjective] A process or reaction that releases heat. Wood burning in the presence of oxygen is an example of an exothermic reaction.

Go to term