Is this a moment of change in Iran?

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In Tehran, crowds are gathering, as Ayatollah Ali Khamenei is due to address Friday Prayers in Tehran for the first time in eight years. This comes in the light of the recent missile attack by Iran on US military bases in the Iraqi city of Baghdad. Ukraine's prime minister has offered to resign after a secret recording was published in which it's claimed he criticised the country's President. Can you imagine a world where the digital devices we wear on our arms or other parts of your bodies could be used by doctors to predict whether you are about to come down with an illness.