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In this activity (on pages 49-54 of PDF), learners play with tangrams, a set of triangles, squares and a parallelogram that can combine into a larger square as well as all sorts of other shapes.

In this activity, learners build bridges using paper and explore how much weight each bridge design can support.

In this activity, learners will examine various world data maps to combine the information and predict which areas could be tropical rainforests.

In this activity, learners make a flip book that shows the progression of two solar events on reversible sides of the flip book.

Learners will explore the scientific mystery behind a disappearing group of trees by examining data and attempting to explain the decline.

Professor John Endler traveled to Trinidad in the 1970s to study wild guppies. In this activity, learners take part in an online simulation of Endler's work.

Make a kite out of a garbage bag, shower curtain, painting tarp--anything light, thin, flexible and plastic!

This activity is a hit for family events and all ages—some will finish in 45 minutes; others can go on for hours.

In this activity, learners practice drawing 3D structures in two dimensions. Learners draw cube stacks from five different points of view.

In this math lesson, learners practice reading charts and graphs by creating and interpreting glyphs.

The popular sudoku puzzles use numbers, but the game could played with any set of 9 different objects!

In this activity, learners add squares to paper dominoes to make polyominoes.

This lesson (on pages 46-55 of PDF) features two strategy board games -- one from Ghana and one from China. The first game, Achi, is a cross between checkers and tic-tac-toe.

In this activity, learners explore the potential of interchangeable standard parts to create a large number of unique creations in different combinations.

In this activity, learners use sets of cards to assign microorganisms to different groups.

In this activity (8th activity on the page) about the sense of touch, learners make their own set of Braille letters. Learners use glue to make raised dots on a Braille Alphabet Sheet.

In this activity, learners use earthworms as "unknown creatures" from the South American jungle to find out how animals use senses.

In this math puzzle game, learners work together to use algebraic reasoning and fun clues for solving word puzzles.

In this activity, learners investigate feeding relationships. Learners complete a food web and then make a mobile to represent a food chain.

In this activity (on pages 22-24 of the PDF), learners match extreme enviroments with life forms they support.