Longevity app calculates your life expectancy – but will it make us healthier?

Would knowing the date of your death influence your actions? It did for Tiberius Caesar. Convinced by the court astrologer Thrasyllus that he had many years of life ahead of him, the paranoid old emperor chose to postpone the murder of his heir Caligula. But by believing Thrasyllus’s prediction and letting his guard down, Tiberius …

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