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

Density is defined as

Go to Quiz

Module of the day

Introduction to Paleoanthropology

Paleoanthropology is the study of human ancestry through fossil remains and other evidence. This module explains how paleoanthropologists uncover and evaluate…

Go to module

Term of the day

dissolved solid

[noun] Organic and inorganic substances that have dissolved into a volume of water. Dissolved solids include salts, minerals, and other materials that…

Go to term