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Paths and Ponds
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In this activity, learners use squares to figure out how many border tiles are needed to enclose different areas.

Your Age on Other Worlds
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Did you know that you would be a different age if you lived on Mars? It's true!

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

Making a One-Second Timer
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This lab activity has learners create a pendulum with a one-second period.

Pulleys
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In this activity, learners build inexpensive pulley assemblies from pulley wheels used for sliding screen door replacement or from clothesline spreaders.

Exploring Baking Powder
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In this activity, learners examine baking powder, a combination of three powders: baking soda, cream of tartar, and cornstarch.

Drying It Out
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In this activity, learners investigate and compare the rate of drying in different conditions.

Sizing Up Hail
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In this activity, learners will estimate the sizes of balls to learn how to estimate the size of hail. Learners will compare their estimates to the estimates of their peers and the real measurements.

Comparing the Density of an Object to the Density of Water
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Learners compare the weight of equal volumes of wax, water, and clay. Learners discover that since the wax weighs less than an equal volume of water, it is less dense than water and will float.

Don't Crack Humpty
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Groups of learners are provided with a generic car base and an egg. Their mission: design a device/enclosure to protect the egg on or in the car as it rolls down a ramp with increasing slopes.
Rate It: Working With Zero and Negative Numbers
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In this activity, learners will rate the day, a book, or something else on a scale from -2 to 2. This activity works well for groups of all ages.
Investigating Density Currents
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In this lab activity, learners explore how to initiate a density current. Learners measure six flasks with different concentrations of salt and water (colored blue).

Take It From The Top: How Does This Stack Up?
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In this activity, learners explore center of gravity, or balance point, of stacked blocks.

Beaded Braids: Investigating Patterns & Ratios
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In this activity learners create patterns of hair beads.
Measuring Rules
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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 .

Soccer
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In this math activity (Page 12 of the Play Ball! PDF), learners play a game of "soccer" and analyze the results of the game.

Adherence to HIV Treatment
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In this activity, learners simulate taking HIV antiretroviral drugs by using Tic Tac mints and Kool-Aid packets.

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

Watching Crystals Grow
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Learners will compare the growth rate and appearance of crystals forming on small rocks to those growing on miscellaneous objects. Learners will also investigate how temperature (warm vs.

Walking Polygons
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In this activity, learners walk the sides and interior angles of various polygons drawn on the playground. As they do so, learners practice rotating clockwise 180° and 360°.