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

Percy Lavon Julian

The module traces the life and career of organic chemist Percy Julian, who developed a way to synthesize cortisone in large…

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Term of the day


[noun] In statistics, estimation is the process by which population parameters are estimated based on subsample statistics. Scientists typically use two different…

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