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This quiz lets you estimate your annual radiation exposure.

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.

This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest.

This is an online game about the complexities of farming. Learners will "draw" cards and make decisions about how to take care of their farm.

In this game, learners match descriptions of marine debris (shoes, batteries, paper towels, etc.) to images of these items.

In this activity, learners try to figure out who has their matching rock type by reading a description of their rock (no talking!).

This fun and simple hands-on astronomy activity illustrates the value of supernovae in the universe.

In this outdoor, night-time activity, learners discover how to spot eye-shine (reflection of light from an animal's eyes) by using a flashlight to play a simulation game.

In this interactive game, learners listen to the songs of four different thrushes and then try to match each bird with its song.

In this activity, learners play a card game that explores the relative sizes of various objects. Learners compete to organize their hand of cards into lists of objects from largest to smallest.

In this outdoor activity, learners play a game of Tag to discover how neurons attach themselves to each other to form a chain.

In this activity, learners find the answer to the question, "if you have a pile of 8 cards, and you remove half, then half again, how many times can you do this until you get to just one card?" This w

In this activity, learners play a card game that explores different size scales--macro, micro and nano.

These two activities (4th on the page) demonstrate the importance of two eyes in judging depth.

In this "game," learners explore and relate the evolution of stars to a Navajo creation story. The story is written on a series of cards, which are laid on a table as the story is told.

In this online activity, learners will explore size estimation in one, two and three dimensions. Multiple levels of difficulty allow for progressive skill improvement.

In this online activity, learners will brush up on their multiplication, division, and factoring skills with this exciting game.

This online interactive has three activities in the NanoLab (press the upper right button): Build, Zoom, and Transform.

This activity lets learners participate in the process of reconstructing a phylogenetic tree and introduces them to several core bioinformatics concepts, particularly in relation to evolution.

In this activity, learners participate in several full-body interactive games to model the process of self-assembly in nature and nanotechnology.