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Skin, Scales and Skulls
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In this activity, learners examine body parts (including skin, scales, and skulls) from fish, mammals and reptiles. Questions are provided to help encourage learner investigations.

Plankton Feeding
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This activity provides a hands-on experience with a scale model, a relatively high viscosity fluid, and feeding behaviors.

Introduction to Ocean Zones
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In this activity, learners will create a diagram of the ocean zones and determine what organisms live in each zone.
Dowels and Rubber Bands I
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If you have 3-foot dowels and rubber bands, you can can started on this fun and open design challenge. You can make structures big and small: make it so you can fit your parent into it!

Mitten Challenge
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In this activity, learners try to put together toy bricks—wearing oven mitts on their hands! This activity shows learners how difficult it is to build small things when your tools are too big.

Exploring Size: Powers of Ten
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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.

Exploring Size: Measure Yourself
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In this activity, learners mark their height on a height chart and discover how tall they are in nanometers.

Life Size: Line 'em up!
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In this activity on page 1 of the PDF, learners compare the relative sizes of biological objects (like DNA and bacteria) that can't be seen by the naked eye.

Scale Model of Sun and Earth
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In this activity, learners explore the relative size of the Sun and Earth as well as the distance between them.

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

Toilet Paper Solar System
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In this activity, learners build a scale model of the solar system using a roll of toilet paper.

The Thousand-Yard Model
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This is a classic exercise for visualizing the scale of the Solar System.

What am I?
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In this activity, learners examine nanoscale structures of common things.

Exploring Tools: Mitten Challenge
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In this activity, learners build a LEGO® structure while wearing mittens. This activity shows learners how difficult it is to build small things when your tools are too big.

Size Wheel
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In this fun sticker activity, learners will create a size wheel with images of objects of different size, from macroscopic scale (like an ant) to nanoscale (like DNA).

Forwards and Backwards
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In this activity, learners explore acids and bases by preparing six solutions that combine vinegar and ammonia, ranging from acid (all vinegar) to base (all ammonia).

Exploring Size: Scented Solutions
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This is an activity in which learners will find that they can detect differences in concentration better with their nose (smelling) than with their eyes (seeing).

Exploring Size: StretchAbility
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In this game, learners explore the different sizes of things in the world. In this Twister-like game, learners must place a hand or foot on a circle of the right scale - macro, micro, or nano.

Sizing Up the Universe
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In this online interactive challenge, learners choose items to represent the Earth or solar system, then determine other items to represent the Moon, or Milky Way based on their relative size.

Cutting it Down to Nano
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This simple activity uses paper and scissors to convey two key concepts to learners: the nanoscale is very small and working on the nanoscale requires special tools.