So take a tub full of microscopic colloidal blobs, make the blobs roll around by applying an external electrical field, and you can get the whole mess to swarm.
http://www.nature.com/nature/journal/v503/n7474/full/nature12673.html http://www.nature.com/nature/journal/v503/n7474/full/503043a.html Pretty darn clever for puree of Jello. -- rec --
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