How many roman emperors ruled during the 50-year period covered by this chart how died a natural death what was most frequent cause of these men?

There are five emperors listed - Claudius Tiberius (died natural causes), Vespasian (died natural causes), Gaius Caligula (assasination), Tiberius Julius Caesar (died natural), Aulus Vitellius (violent - was dragged through streets and murdered by angry mob)

When were hammocks first invented?

Why is it sometimes important not to leave out the message thread i.e. previous messages in email chain plus?

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