Given the formula of an arithmetic sequence, either in explicit form or in recursive form, find a specific term in the sequence. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or...

Given the formula of a geometric sequence, either in explicit form or in recursive form, find a specific term in the sequence. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or...

Find the first few terms of sequences that are defined recursively. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Two systems of equations are equivalent if they have the same solution(s). This article reviews how to tell if two systems are equivalent. Examples are provided.

Practice telling if shapes are divided into 2 or 4 equal sections. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a tutorial video, or receive hints.

Test your knowledge on the modernization of society.

The purpose of this activity is to gain a sense of how much and what types of energy we use today in order to help us understand how much things have really changed over the last 500 years. It also helps us think about how our energy...

Acceleration, an increase in the rate of change, is occurring both in the Universe and in human culture on planet Earth. This article explains these fascinating changes.

An article describing how the sun, planets, moons, and beyond Pluto was formed. Learn more about the beginning of our solar system.

Did you know the continents on Earth are in constant motion? Our knowledge of this is thanks to both Alfred Wegener and Harry Hess. This article discusses the work of these two scientists.

A gallery of pictures of the cosmic beauty of the Sun, our Solar System, and exoplanets. Pictures include a caption of what the viewer is looking at.

Learn how researchers find large differences in how effectively various groups of people can use digital technology.

Learn about the differences in which households have access to computers and the Internet.

Find out more about how the infrastructure of the Internet is not distributed equally.

Learn about the difference in access to technology across the globe.

Learn about citizen science: the participation of the general public in scientific research.

Explore how crowdsourcing helps us to create common goods, invent new products, and make scientific discoveries.

Use the Internet to search for news stories about the Modern Revolution and discuss the provided questions. Helpful links are provided to get you started.

A five question quiz over the concepts about the beginning of life on Earth. Test your knowledge of this topics.

A glossary of terms related to the development of the modern world.

Test your knowledge of collective learning with this quiz.

In the final essay of a four-part series, David Christian explains how advances in communication and transportation accelerated collective learning.

This activity provides you with an opportunity to start thinking about the impact that farming can have on the way humans live and relate to each other. It will also allow you to think about the kinds of questions archaeologists and...

Test yourself over the Anthropocene era.