In today’s English, oh is an interjection used to express a range of
emotions, including pain, sorrow, hesitation, and recognition. Most people
will never have use for O, which is used in poetic apostrophe, usually in
classical addresses, always preceding the name of or pronoun representing the
person being formally addressed.
https://grammarist.com/usage/o-oh/
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“Experts are just trained dogs.”
— Albert Einstein
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