Doctors who watched 's address to the nation tonight have revealed the subtle clues about the president's health.
They pointed out that the speech was relatively short - coming in at just 11 minutes - and that Biden read exclusively from a teleprompter, making it difficult to make an a definitive assessment of his mental and physical wellbeing.
However, neurologist Dr W. Chris Winter picked up on the 81-year-old's low blink rate.
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