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When he made a point to always announce that he was feeding his fish.
In his book Dear Mr. Rogers, Does It Ever Rain in Your Neighborhood?: Letters to Mr. Rogers, he shared a letter from a little girl named Katie, who worried about his fish. She was blind and couldn't see when he fed them, so she asked him to say out loud when he was feeding them, so she would know.
"Since hearing from Katie, I've tried to remember to mention out loud those times that I'm feeding the fish. Over the years, I've learned so much from children and their families. I like to think we've all grown together," he wrote.