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

The amplitude of a wave is a measure of its

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Module of the day


Isaac Newton's description of gravity was not the first explanation of this phenomenon, nor was it the last. This module explores…

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Term of the day

electron shell

[noun] The orbitals around the nucleus of an atom where electrons reside. Also called electron orbitals and energy levels.

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