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The chemical formula is a subtle joke...
The joke is that the paper is called "Synthesis of Co-Fe-Pd nanoparticles via ultrasonic irradiation and their electro-catalytic activity for oxygen reduction reaction" which is clever in itself and quite funny to those with a degree in chemistry but what's really just hilarious about it is that if you look closely at the chemical formula, Co5Fe2, you can see a 5 that reads "Five". Now, this might go over the average viewer's head as this, THIS, is peak comedy. I doubt anything will ever be as hidden as the message in the covfefe tweet. Are you ready for this one? So, like I said, the chemical is called "Co5Fe2" and this paper says "Cobalt 5 Iron Iron, Co5FeFe", which means that when 5 is substituted by a roman numeral, well, I don't have to tell you...
