invisible
Invisible Sunblock
In this activity, learners compare nano and non-nano sunblock products to discover the effect of particle size on visibility.
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![Learner demonstrates how an electroscope interacts with static electricity](https://nisenet.org/sites/default/files/styles/curated_list_large_cropped/public/static_activity.jpg?h=af834073&itok=O_SL-dac)
Exploring the Universe: Static Electricity
In this activity, learners will discover how static electricity works by building a simplified tool that detects invisible forces on Earth and in space.
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![A photoshopped image of people wearing invisibility cloaks hiding everything but their legs](https://nisenet.org/sites/default/files/styles/curated_list_large/public/images/catalog/11944/screen_shot_2013-08-29_at_12.49.41_pm.png?itok=LK6tkV9N)
Invisibility Cloak video
In this 4-min video the idea of invisibility cloaks is comedically explored.
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![Girl looking at objects in a beaker filled with liquid that appear to be invisible](https://nisenet.org/sites/default/files/styles/curated_list_large_cropped/public/images/catalog/11070/invisibility_2.jpg?h=e4c0da04&itok=Nb5ewATQ)
Exploring Properties - Invisibility
In this activity, learners investigate how glass objects can be "hidden" in some liquids through refraction.
Product
![Hands holding glass objects on a string in a beaker of liquid](https://nisenet.org/sites/default/files/styles/curated_list_large_cropped/public/images/catalog/10907/invisibility.jpg?h=9e2aa9b8&itok=sR3DScO6)
Exploring Nano & Society - Invisibility Cloak
In this activity, learners explore how refraction can be used to make a glass stir rod "disappear" in a cup of baby oil, while having conversations about new technologies.
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