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

Meselson and Stahl

Testing predictions is a major part of scientific research, and a key component of many classic experiments. This module explores the…

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Term of the day

colloid

[noun] A mixture in which minuscule insoluble particles are distributed in a liquid and remain dispersed in the liquid. Homogenized milk is…

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