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

Which element is classified as metalloid?

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Module of the day

Acids and Bases

Since acids and bases were first labeled and described in the 17th century, their definition has been refined over the centuries…

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Term of the day

cytokinesis

[noun] The process of cell division in the eukaryotic cell cycle, characterized by the cytoplasm dividing to form two daughter cells.

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