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"Although incredibly inventive, the girls device isnt quite ready to power up a house just yet. As Co.Exist points out, the separation of hydrogen from urine still requires an outside source of electricity. Another issue is safety, Forbes notes, since hydrogen poses an explosion risk. Still, theres no doubt that the teens are on the right track when it comes to thinking about creative ways to harness energy."
"outside source of electricity" -- since it requires an outside source, it must use more than it produces.
This is nothing more than a cursorily.