Minamata disease is a degenerative neurological disorder characterized by a loss of coordination and peripheral vision, poor articulation of speech, and numbness of the extremities. It was first encountered in 1956, when numerous cases of the then-unknown disease were observed in Minamata, Japan. Investigations showed that the consumption of seafood contaminated by a local chemical factory's mercury-laden wastewater caused the disorder. What brought more attention to the disease in 1965?