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Yeast Balloons
Source Institutions
Visitors observe a bottle with a balloon attached around the mouth. The bottle contains a solution of yeast, sugar, and water.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-894.jpg?itok=xTJzwp1U)
Stop the Stretching
Source Institutions
Learners work with plastic sheeting, masking tape, and string to design the perfect material for plastic chair webbing, and then construct their webbing.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-661.jpg?itok=4bXcMGPE)
DNA Nanotechnology
Source Institutions
In this activity, learners explore deoxyribonucleic acid (DNA), a nanoscale structure that occurs in nature.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-600.jpg?itok=PHl8rFHc)
Single-Cell Life
Source Institutions
In this activity, learners create a soil and water model of a single-cell life environment and study living microorganisms.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-820.png?itok=snUC8JQQ)
Animals in a Grassland
Source Institutions
In this outdoor, warm weather activity, learners use sweepnets to search a grassy area such as a large lawn or field, collecting small animals to find as many different kinds of animals as possible.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-203.png?itok=SI-5-Hox)
Snug as a Bug
Source Institutions
In this outdoor activity, learners make models of homes that might protect small animals from the elements, then search living plants for real structures made by small animals.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-139.jpg?itok=n8YXW_Ka)
Mystery Tubes
Source Institutions
Learners investigate a pre-constructed mystery tube to determine its interior mechanism.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-628.png?itok=DYrrPKsh)
Clam Hooping
Source Institutions
In this two-part outdoor activity, learners conduct a population census of squirting clams on a beach or mudflat, and investigate the clams' natural history.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-073.jpg?itok=KfbyMQrt)
Take Out the Trash
Source Institutions
Learners explore how recyclers take advantage of the different properties of materials, such as magnetism and density, to separate them from a mixture.
Stability of Egg White Foams
Source Institutions
In this chemistry meets cooking activity, learners compare the stability of egg white foams with various additives.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-760.png?itok=8DKLLRkc)
Ocean Home: Swimming Fishes
Source Institutions
In this activity, learners model, on a human-sized board game, how changes in water temperature may affect fish distributions and, ultimately, fisheries.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-005-487.jpg?itok=CLamDqB4)
Pollinator Play
Source Institutions
In this activity, learners will build a bee hotel for pollinators. Learners will explore building and ecology through this activity.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-323.jpg?itok=Eq5NsG0G)
Invent a Plant
Source Institutions
In this activity, learners construct models of plants that are adapted to living under specific environmental conditions.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-335.png?itok=CRarAbFR)
Changing Colors
Source Institutions
In this challenge, learners have to figure out in what order to combine five solutions to change the color from clear, to yellow, to blue, and back to clear.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-751.jpg?itok=74DWM0V8)
Crime Scene Investigation (CSI) with Powdery Mildew Fungi
Source Institutions
This exercise can be used to stimulate the investigative nature of learners as they use forensic plant pathology techniques to prove the learners' innocence in a mock murder investigation.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-779.jpg?itok=2gtZWZAU)
Who Dirtied The Water?
Source Institutions
In this activity, learners receive a labeled plastic film canister containing a material representing a pollutant (i.e. pencil shavings = a beaver's wood chips).
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-000-974.png?itok=pGOj_CCM)
Fruit Juice Mystery
Source Institutions
In this chemistry challenge, learners work to figure out which of four juices are real, and which is just food coloring and sugar.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-478.png?itok=ktl7MPF-)
Investigating Starch
Source Institutions
In this activity (on pages 10-15), learners investigate starch in human diets and how plants make starch (carbohydrates) to use as their food source.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-227.png?itok=H8LSNDr4)
OBIS Oil Spill
Source Institutions
In this outdoor activity, learners simulate an oil spill using popcorn (both oil and popcorn float on water), and estimate the spill's impact on the environment.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-509.jpg?itok=ECwLpory)
Law of Conservation of Mass
Source Institutions
In this chemistry activity, learners explore whether matter is created or destroyed during a chemical reaction. They will compare the weight of various solutions before and after they are mixed.