E Minamata disease Q&A

1. Outbreak & Cause 

Q1: When did Minamata disease occur?
Q2: What is the cause of Minamata disease?
Q3: What a company was the source of the pollution that caused Minamata disease?
Q4: How was the cause of Minamata disease revealed?
Q5: Did Minamata disease occur in other places as well as Yatsushiro Sea coast?
Q6: How many Minamata disease patients are there?