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Researchers at the MIT Department of Chemical Engineering have created a new method of cleaning micropollutants from water, using zwitterionic molecules — i.e., molecules with the same number of positive and negative charges.

Devashish Gokhale, a PhD student and one of the researchers, explained zwitterionic molecules by comparing them to magnets.

“On a magnet, you have a north pole and a south pole that stick to each other, and on a zwitterionic molecule, you have a positive charge and a negative charge which stick to each other in a similar way,” he said in a release by MIT News.

AI has come to the hiring process — and it’s made those mandatory personality tests all the weirder.

As 404 Media reports, companies as disparate as McDonald’s, Olive Garden, and FedEx are now requiring that job applicants take personality evaluations, which are then sorted by an AI system whose operations are cloudy at best.

The aforementioned companies are all contracted with Paradox.ai, a “conversational recruiting software” company whose strange personality assessments include images of blue-skinned humanoid aliens that applicants are, apparently, supposed to identify with.