Image: Danger sign hydrogen
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Description: Danger! Water contains high levels of hydrogen. Keep out.
Title: Danger sign hydrogen
Credit: Louisville's Municipal Sense of Humor
Author: joeymanley from Flickr
Usage Terms: Creative Commons Attribution-Share Alike 2.0
License: CC BY-SA 2.0
License Link: https://creativecommons.org/licenses/by-sa/2.0
Attribution Required?: Yes
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