filtration
![Person looking closely at a cup filled with dirty water](https://nisenet.org/sites/default/files/styles/curated_list_large/public/images/catalog/12005/screen_shot_2013-09-18_at_1.07.24_pm.png?itok=-OxbhvBp)
What’s Nano About Water?
In this 30-second video, viewers quickly learn how nanotechnology can filter pesticides and heavy metals out of water.
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![Learners pour beads into a sieve filter to sort by size](https://nisenet.org/sites/default/files/styles/curated_list_large_cropped/public/images/catalog/8883/20110918gh192.jpg?h=4de69ae3&itok=Bn5ClXkh)
Exploring Size - Ball Sorter
In this activity, learners use sieves with different-sized holes, to sort balls by size and investigate filtering.
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