What does the Hippo Water Roller have in common with rats, soccer balls and motorbikes? http://www.one.org/us/2015/06/23/4-innovators-changing-t...

Published on June 30, 2015 10:27 by Grant Gibbs, Exective Director at Hippo Roller

What does the Hippo Water Roller have in common with rats, soccer balls and motorbikes? http://www.one.org/us/2015/06/23/4-innovators-changing-the-world-in-unexpected-ways/

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