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

History of Earth's Atmosphere I

This module looks at how the Earth's atmosphere has changed since the planet came into existence. Starting with clues provided by…

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Term of the day


[noun] Any of a class of nitrogen-containing organic compounds that come from plants and have an effect on the body. Common alkaloids…

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