This resource presents a complete and detailed look at linear regression. This guide provides lots of details and graphs to explain each concept.

Discover some of the deep questions that scientists and philosophers ask about time and some of the ideas that emerge from each one.

In this lesson, students examine primary source materials to investigate how ideas change and evolve over time and what impact past ideas have on people's perceptions of the present, or how the present may be perceived at some future time.

Explore scientific data relating to the atmosphere, oceans, areas covered by ice, and living organisms in all these domains. Interpret past and present climate data to predict future climate change and its possible effects.

Plants give us insight into the past, sustain the present, and prepare for the future. Peruse the article to appreciate the value of angiosperms.