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

Homo sapiens is

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Module of the day

Light I

For centuries, controversy over whether light is made of particles or waves abounded. This module traces the controversy over time, from…

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Term of the day


[noun] The movement of ions along an electrochemical gradient through a membrane. Usually, the term is applied in connection with a proton…

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