In this lesson, students measure the dimensions of their own fist plus the fists of some other people who are older to approximate the size of each person's heart. Next they use construction paper to make a model of their own heart.

Every living thing must be able to reproduce and make offspring. Most of us are familiar with how humans and mammals make babies, but do all creatures reproduce in the same way? Do insects, like the beetle, give birth to little insects? Also in: French | Spanish

This classroom activity is an inquiry based lesson where students observe and measure temperature changes in order to determine which fabrics are best at keeping in heat.

This inquiry lab activity involves students working to observe and describe to how worms will interact/adapt with their environment.

Aaron and Justin investigate which sunscreen best keeps out harmful ultraviolet rays from the Sun, in this video from DragonflyTV.

This activity is a lab investigation in which students design and conduct experiments using pineapple juice containing the enzyme bromelain and its affect on the substrate gelatin found in Jell-O. The focus of student driven investigations are on enzyme specificity, activity and the impact of environmental factors on enzyme functioning. Based on the original activities from School Improvement in Maryland; "Pineapple/Jell-O Lab," Access Excellence Activities Exchange; "Enzyme Labs Using Jell-O" by Anne McDonald and Michael O'Hare, and AP & Regents Biology; "Lab 8: Pineapple Enzymes and Jell-O Molds" by Kim B. Foglia.

The activities in this 6-lesson unit use fish-shaped crackers to help students develop their understanding of comparative subtraction by exploring five meanings of subtraction (counting, sets, number line, balance, and inverse of addition). Students investigate properties of subtraction, represent subtraction with objects and pictures, record subtraction with vertical notation and equations, create and solve problems, and carry out missing addend activities. Lessons include questions for student discussion and teacher reflection, extensions, printable student sheets, assessment options, and links to online applets.

This interactive Flash applet helps students develop number sense and fluency with addition and subtraction facts within 10. Okta hides some bubbles under a shell, and then either adds more bubbles or takes some away. Students determine how many bubbles are left under the shell. Users can choose a specific one-digit starting number or let the applet choose randomly. Users can select addition, subtraction or both.

This is an activity where students learn about inquiry by designing an experiment on bean plants with the goal of growing the tallest plant. Students work in groups to plan the growing conditions of the control and three experimental plants. Students collect data for about three weeks and analyze their data to see if their hypothesis is correct or not. The end product can be a report presented in a number of ways.

Students learn how the human body self-regulates to maintain a stable internal environment despite changes in the external environment.

This lesson guides students to learn the science behind cloning, explore the benefits and consequences of human cloning, and communicate their knowledge and points of view. Students begin by reading an article titled Primer on Ethics and Cloning by Dr. Glenn McGee, available for free on the AIBS's ActionBioscience.org website. The lesson provides questions for the instructor to guide a class discussion about the article. Instructors can then choose from different activities to engage students further in this issue. One activity has students role play advisory teams providing information to a committee on the ethical issues of human cloning. The teams conduct research online, keep a journal recording their research paths, and answer questions in presentation format. Another activity has students researching and presenting information on human cloning. Through their research students can learn about cloning technology and related laws, as well as the perspectives of groups or individual scientist's viewpoints. Included are web site evaluation worksheets that are useful for student internet searches on any topic.

Students investigate hominid evolution. They learn the difference between a relative and an ancestor, study the emergence of bipedalism, and chart patterns of hominid migration.

This video segment from The Human Spark features a discussion about how human thought differs from that of chimpanzees.

In this video segment adapted from the National Film Board of Canada, learn how the Inuit people have used their traditional knowledge to understand and adapt to changes in their Arctic environment, particularly when hunting and navigating the landscape.

This activity is designed for students to discover how making observations of the environment is the key to making sound predictions. Students will also learn how both positive and negative outcomes of these predictions can affect and shape future decisions.

This is a five-activity module that explores the evidence for and impacts of melting glacial ice, with resources from major institutions and scientists who study glaciers -- primarily in Arctic areas. The suite of activities includes both glaciers and melting ice, as well as the impact of melt water downstream. Each activity follows the 5E model of Engagement, Exploration, Explanation, Elaboration, and Evaluation.

A young, injured otter must find his way during the winter in Yellowstone National Park in this segment from Nature.

Students will create and investigate testable questions about how basil changes based on growing conditions.

During this activity, students will investigate leech behavior. Students will learn to ask a question about leech behavior that can be investigated.

In this segment from Curious, learn how a robot is a machine that can connect with its surroundings and has some level of autonomy.