Did you know that if you put taco sauce on a penny it will make it shiny? Do you believe this? Let's test it to find out...
Yes, it is shiny! Now lets find out which ingredient in taco sauce makes the copper penny shine. Is it salt, or water, or tomato paste, or vinegar? What do you predict?
None of the ingredients alone works as well as the taco sauce. I know, lets put 2 ingredients together...
We tried salt and vinegar... IT WORKS LIKE MAGIC! The penny was very, very shiny!
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