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Einstein a famous scientist Einstein was a great scientist. prodigy a very smart or talented child He is a music prodigy. observant good at noticing small things She is very observant. tremble to shake a little I tremble when I am cold. invisible cannot be seen Air is invisible. force a power that pulls or pushes mechanism how something works inside exceptionally very, very much He is exceptionally smart. needle the moving arrow in a compass The needle points north. rotate to turn around