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

Luis Walter Alvarez

Luis Alvarez is less famous for his Nobel prize-winning research into subatomic particles than for his theory on how dinosaurs became…

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Term of the day


[noun] Chromatin is the substance inside of the cell's nucleus and it consists of DNA, proteins (primarily histones), and chromosomal RNA. The…

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