Explain why?

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You can just choose one or explain all. Some are stupid, doesn't make sense, but whatever, I hope you understand that I'm doing this for mylot. Thanks. Why.. 1. parrots talk other birds not? 2. people need pillows? 3. cigarettes invented to harm health? 4. cellphones in other country are advance? 5. do you make a problem a problem? ---------- Do you have more why questions to share?