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In this activity, learners write invisible messages on goldenrod paper, and make the message appear and disappear using acids and bases.

This activity is on page 10 (continued on the right side of page 11) of the pdf, part of the Forest Animals Discovery Box. In this game, learners act out the food web.

In this bilingual (English/Spanish) activity, learners create family trees by tracing the hands of their family members.

In this activity on page 8 of the PDF, learners make a slimy substance very similar to mucus, and sprinkle it with glitter to imitate the way that allergens are trapped.

In this activity, learners act as epidemiologists by mapping the prevalence of HIV/AIDS worldwide.

In this activity, learners explore dinosaur fossils and skeletons. First, learners listen to "Tyrannosaurus Rex" by Daniel Cohen to learn about T. rex dinosaurs specifically.

In this engineering activity, young learners investigate multi-level buildings.

In this activity, learners use a simple trick of perspective to dress friends in tiny cutout clothing. Learners make tiny pants out of card stock and tape them to the end of a stick.

This fun and simple hands-on astronomy activity lets learners make 3-dimensional models of the Earth and Moon.

This activity (on pages 13-18) has learners build a model tree and then figure out how to make their tree stand up by itself.

Make a one-string "guitar" by stringing a cup with some fishing line. You amplify the plucking of the string by placing a piezo contact microphone and mini battery powered amplifier inside the cup.

This activity shows learners (with adult supervision) how to make a Glitter Globe, a fabulous toy that shimmers when you shake it.

This reading and writing activity (on pages 2-9) teaches what plant parts should be avoided, how a person can get rid of toxins, symptoms of plant poisoning, and how plants create poisons to repel pre

In this activity, learners use design thinking to design and build their own bridge out of household materials including adhesives and/or connectors.

The Sacred Cenote at Chichén Itzá is a sink hole, or well, containing groundwater. In this activity, learners create their own cenote using chalk, limestone, acids, and rain water.

Learners design and create musical instruments from common objects; their challenge is to create an instrument that can make three different tones.

In this activity, learners explore electricity and conductivity to find that many things conduct electricity including copper, pencil lead, fruit, play-doh, and even people!

Students design and create their own air-powered rockets, in this hands-on activity.

This outdoor activity/field trip requires a place where minnows swim, such as a local pond or brook.

In this activity, learners design a flag for a chosen or assigned planet. The instructions include information about flags on Earth, and a list of flag references.