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Pea Brain!: Explorations in Estimation
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In this activity, learners use two different techniques to estimate how many little things fit into one bigger thing.

Pennies for Pits
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In this math lesson, learners use fruit to learn about proportions and percentages. Learners compare the weights of the edible and non-edible portions of fruit.

Exploring Measurement
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In this "Sid the Science Kid" activity, learners use their bodies to measure a room. Instead of inches or feet, how many kids does it take to measure the length of a room?

The Search for Secret Agents
Learners tour their school or home looking for sources of indoor air pollutants (IAPs).

Shark Sizes
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In this graphing exercise (page 2 of the pdf), learners compare their own height to the length of various sharks.

Swing in Time
Learners build and investigate pendulums of different lengths. They discover that the longer the string of the pendulum, the longer the time it takes to swing.

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

Chew that Gum
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In this quick activity (page 1 of PDF under SciGirls Activity: Exercise and Memory), learners will investigate what happens to bubble gum when it is chewed for 5-10 minutes.

Measuring Wind Speed
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In this indoor and/or outdoor activity, learners make an anemometer (an instrument to measure wind speed) out of a protractor, a ping pong ball and a length of thread or fishing line.

Small Snails, Enormous Elephants
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This activity (located on page 2 of PDF) introduces learners to the real size of animals using nonstandard measurement.

Atmosphere Composition Model
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In this activity, learners create a model using metric measuring tapes and atmosphere composition data.

How Small Can You Cut?
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In this lesson, learners cut paper into very small pieces to explore the small size of quarks, the smallest thing we know of on Earth.

Dripping Wet or Dry as a Bone?
Learners investigate the concept of humidity by using a dry and wet sponge as a model. They determine a model for 100% humidity, a sponge saturated with water.

Super Soaking Materials
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In this activity, learners will test cups full of potting soil, sand, and sphagnum moss to see which earth material is able to soak up the most water.

Animal Reflection Response
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In this activity (page 1 of the PDF under SciGirls Activity: Horse Ears), learners observe how an animal responds to its own reflection.

Hot Stuff!: Investigation #4
Learners test two jars containing soil, one covered and one open, for changes in temperature. After placing the jars in the Sun, learners discover that the covered jar cools down more slowly.

Shake it up with Seismographs!
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In this activity, learners explore the engineering behind seismographs and how technology has improved accurate recording of earthquakes.

Looking Back Through Time
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In this activity, learners create their own archaeological profiles.

Hot Stuff!: Investigation #2
Learners test two jars containing hot water, one covered with plastic and one open, for changes in temperature.