In a Facebook video that's gone viral, the 12-year-old from Mexico hilariously trolled parents who refuse to vaccinate their children.
Marco set up the clip by claiming everyone had "been lied to by doctors and pharmaceutical companies about vaccines."
"After a lot of research I realized that vaccines do and will cause autism," he said, holding up what he claimed was a damning dossier of his findings.
But when he opened the folder, titled "Evidence That Vaccines Cause Autism," all of the pages were blank.
"I think it might be because there is absolutely no evidence to support the statement that vaccines are linked to autism in any way whatsoever," he said.
"So please, vaccinate your children," Marco, who calls himself a scientist on his Facebook page's profile, added.
Check it out in the clip above.