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


Density is a fundamental physical property of matter. This module introduces the concept of density, explains how density is calculated, and…

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Term of the day

First Law of Thermodynamics

[noun] One of three Laws of Thermodynamics, or laws relating to heat power. The First Law explores the conservation of energy. Specifically,…

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