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In this math lesson, learners count and compare amounts of money less than or equal to one dollar.

In this food science activity, learners explore digestion and proteins by observing the action of meat tenderizer on luncheon meat.

In this activity, learners conduct a simulation exercise related to public key encryption and try to intercept a message sent between two learners.

In this environmental science lesson, learners will examine the dangers of mercury and how humans contribute to growing mercury emissions on Earth.

This activity explores the main algorithms that are used as the basis for searching on computers, using different variations on the game of battleships.

In this activity, learners explore the different salinities of various sources of water by taste-testing.

In this activity, learners discover how to determine the distance to a lightning strike or nearby thunderstorm.

In this outdoor activity, learners investigate the relationship between the slope of a trail and soil erosion.

In this activity, learners use number sense and mental math strategies to estimate the price of a sign.

In this math activity, learners create their own units of measurement by making noodle rulers. Learners practice estimating and measuring objects using the noodle rulers .

In this activity, learners get hands-on experience with ratios and scaling while making their own jewelry out of recycled plastic containers.

In this outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count.

This investigation provides learners with a hands-on activity that simulates the changing relationship of surface areas-to-volume for a growing cell.

In this activity, learners discover how the extent of various wind speeds changes in each of the four quadrants around a hurricane.

This activity introduces the idea that computer scientists measure information by how "surprising" a message is.

In this math game, learners try to earn the most points by winning stacks of four dice. Learners practice number recognition and addition skills.

This is an activity (located on page 4 of the PDF under Surface Area Activity) about surface area and reactivity.

In this team design challenge (page 19-24 of PDF), learners "land" a model Lunar Rover in a model Landing Pod (both previously built in activities #3 and #4 in PDF).

In this activity related to the human circulatory system (on page 10 of the PDF), learners observe the dispersion of a drop of food coloring in water, draw conclusions about the movement of dissolved

In this activity, learners estimate risks associated with different events and compare their estimates to the real possibilities.