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

David Ho

This module profiles renowned AIDS researcher David Ho, who is credited with inventing the “AIDS cocktail” that has saved millions of…

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Term of the day


[noun] A relative measure of the affinity (or attraction) that atoms of an element have for electrons. The higher the electronegativity…

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