A Harvard professor claimed balls found in the ocean were alien tech. They may have just been industrial waste.

• A Harvard professor discovered mysterious metal-rich spherules at the bottom of the ocean. 
• Because of their unique composition, he controversially claimed they were alien in nature. 
• Many scientists refuted this claim, and one now thinks they may just be industrial waste.

A Harvard professor's claims that metallic balls discovered under the ocean may have been made by aliens have been called into question yet again.